Yes. We transmit Code CS3 for SIP and EF for RTP.

We do not support IPV6 for SIP and IAX2 protocol at this moment.

TCP is fully supported on our servers.

SIP communications can be encrypted with TLS-SRTP if your device supports it.

At NextelcoAI, for optimal performance, it’s recommended to select the server that is geographically closest to your location. This helps reduce latency and improve call quality. You can also test different servers by sending a ping to measure response times and choose the one with the best performance. For more guidance, please refer to our server selection documentation.

At NextelcoAI, your main account SIP password is, by default, the same as your Customer Portal password unless you have changed it. If you haven’t updated it, you can use the same credentials to log in and configure your device.

For security, you can change your SIP password at any time through the Customer Portal by navigating to the Main Menu and accessing the Account Settings page.

At NextelcoAI, you can find configuration samples for many commonly used devices and phone systems in our documentation. If your specific device isn’t listed but supports SIP or IAX2 protocols—and at least one of the following codecs: G711u, G729a, or GSM—it should still be compatible with our service. If you need help, our Technical Support team is always available to assist you with setup and configuration.

At NextelcoAI, any device or system that supports SIP or IAX2 protocols is compatible with our service. If you’re using equipment from a previous provider—such as an ATA or IP phone—just ensure it is unlocked and allows configuration changes so it can be properly set up with your NextelcoAI account.

At NextelcoAI, we currently offer Virtual PRI services for inbound traffic, while outbound calls are billed on a per-minute basis. There are no additional charges for increasing the number of channels needed to handle your outbound traffic. If you require more capacity, simply contact our support or sales team for assistance.

At NextelcoAI, as a BYOD (Bring Your Own Device) service provider, all software and hardware installation must be completed by the customer. However, we offer technical support through live chat and a ticket system (email) to assist with setup and configuration.

We also provide detailed step-by-step configuration guides and examples in our documentation to help you get your system up and running smoothly.

At NextelcoAI, our Call Detail Record (CDR) feature provides you with comprehensive insights into all your incoming and outgoing calls. You can use built-in filters to sort and analyze call data based on your needs, and access your complete call history from the very beginning of your account activity.

At NextelcoAI, if you have multiple DID numbers, you can assign a unique name to each one. This name will be displayed in the caller ID name field on your phone whenever you receive a call, helping you easily identify which number is being contacted.

At NextelcoAI, you can easily configure your Caller ID when using devices such as analog telephone adapters, IP phones, or softphones. To set the Caller ID number for your main account, simply log in to the Customer Portal, navigate to the “Account Settings” section from the main menu, and update it under the “General” tab.

At NextelcoAI, you can port out your number at any time by initiating the request with your new service provider. We will authorize port-out requests as long as the information matches your account details. Once the port-out process is complete, be sure to remove the DID number from your NextelcoAI account. If you have any questions regarding the process, please contact our support team for assistance.

At NextelcoAI, if you are interested in volume-based discounts, we encourage you to contact our Sales team with detailed information about your usage. This should include the destinations you plan to call and your estimated monthly call volume. Based on this information, we can provide customized pricing and tailored quotes to suit your needs.

At NextelcoAI, we offer a dedicated Reseller Section within the Customer Portal, providing all the tools you need to successfully resell our services. This includes a White-Label Reseller Interface, allowing you to promote and sell services under your own brand.

We recommend becoming familiar with the NextelcoAI platform before starting as a reseller. For more details, you can explore our Reseller Basic Guide or reach out to our Technical Support team for assistance.

At NextelcoAI, we strongly advise against registering multiple devices using the same account credentials, as this can lead to call routing conflicts and registration issues. If you need to connect more than one device, we recommend creating sub-accounts, each with its own unique credentials. This ensures reliable performance and better control over your setup.

At NextelcoAI, DID numbers are primarily designed for receiving incoming calls. When you make outgoing calls, they are placed through your account rather than directly from a DID number. The caller ID displayed to recipients is the number you have configured in your account settings within the Customer Portal.

At NextelcoAI, standard 911 services route calls through traditional landlines directly to the nearest emergency response center. Enhanced 911 (E911), on the other hand, allows emergency responders to receive the caller’s location information automatically.

With VoIP services, 911 calls are typically routed through a third-party provider, which then directs the call to the appropriate emergency center. Because VoIP operates over the internet, it is essential to keep your registered address up to date in your NextelcoAI account. Unlike traditional phone lines, your number is not automatically tied to your physical location if you move, so maintaining accurate location information is critical for emergency services to function properly.

At NextelcoAI, SIP (Session Initiation Protocol) is the standard communication protocol used to transmit voice calls and multimedia data over the internet. It enables not only voice communication but also supports features like video conferencing, instant messaging, media sharing, and other real-time communication services across networks.

At NextelcoAI, the Phonebook feature allows you to store and manage up to 500 contacts, including support for caller ID name (CNAM) overrides and up to 99 speed-dial codes. This makes it easy to quickly call important contacts using short dial codes.

You can also use CNAM overrides to recognize incoming calls from key contacts, even if their information isn’t available in standard CNAM databases. The Phonebook integrates seamlessly with features like Virtual Fax and SMS—allowing you to quickly select contacts when sending messages, and automatically match incoming messages or calls to saved names for easier identification.

At NextelcoAI, a PBX (Private Branch Exchange) is a phone system that manages a company’s incoming and outgoing calls, as well as internal communication between employees. One of its key advantages is that it allows you to connect more phones than the number of physical lines available, while offering features like call waiting, voicemail, call forwarding, three-way calling, call queues, and IVR menus.

An IP PBX is a software-based version of this system that operates over the internet. It enables remote and mobile employees to stay connected to the company’s phone system and voicemail from anywhere, as long as they have an internet connection.

At NextelcoAI, SIP phones—also known as VoIP phones or softphones—enable users to make calls over the internet using VoIP technology. These phones can be either software-based, where an application is installed on a computer or mobile device, or hardware-based, functioning like a traditional phone but operating over an IP network instead of standard PSTN lines.

At NextelcoAI, packet loss refers to the failure of data—such as audio, video, or other information—to be successfully transmitted over your network. It typically occurs when an internet connection is overloaded or lacks sufficient capacity.

For optimal call quality, packet loss should ideally be zero while using VoIP services. High packet loss can result in poor audio quality, echo, jitter, or dropped information during calls. It may be caused by hardware or software issues, including network congestion, faulty cabling, or insufficient bandwidth.

At NextelcoAI, latency refers to the time it takes for data to travel over the internet and through network connections to reach our VoIP services. Along with bandwidth, latency is a key factor in determining call quality. High latency can lead to issues such as static, dropped calls, and choppy or delayed audio during conversations.

At NextelcoAI, DISA (Direct Inward System Access) is a feature that allows inbound callers to access outbound calling services through your account, similar to a calling card system. When configured with a DID, callers can dial in, enter a PIN for authentication, and then place outbound calls to their desired destination using your NextelcoAI account.

At NextelcoAI, IVR (Interactive Voice Response) acts as a virtual receptionist for your phone system. It allows incoming callers to interact with a voice menu using their keypad or voice commands, helping route them to the correct person, extension, or department. This improves efficiency by enabling callers to quickly access the information or support they need without waiting for a live agent.

At NextelcoAI, Caller ID Filtering allows you to manage incoming calls based on their origin, such as private, anonymous, unknown numbers, or specific area codes. You can create filters for each DID to handle unwanted calls—by routing them to voicemail, playing a pre-recorded message, or disconnecting them entirely.

At the same time, you can prioritize important callers by applying custom routing rules, ensuring your valued customers receive a personalized and seamless calling experience.

At NextelcoAI, the Callback feature allows you to set a number that our system will call back, giving you a dial tone to place outgoing calls through our network. This is especially useful when you’re outside your usual calling area or don’t have access to a VoIP device. When a DID is configured with Callback, calling that number will trigger a busy signal, followed by a return call from the system, allowing you to proceed with your outgoing call.

At NextelcoAI, Call Forwarding allows you to redirect incoming calls to another phone number or device, such as a mobile phone, tablet, or computer. You can forward calls to virtually any number worldwide. This feature can be easily configured through your phone, Customer Portal, or VoIP software, ensuring you never miss a call by routing it to your preferred device or destination.

At NextelcoAI, virtual SIP numbers function similarly to standard DID numbers, with one key difference—they are not accessible through the traditional PSTN (public telephone network). Instead, they can only be reached via SIP URI over the internet.

For example, if you have a DID number with another provider that supports SIP URI forwarding, you can route calls to a virtual SIP number on NextelcoAI just as you would with a regular DID, enabling flexible and internet-based call handling.

Toll-free numbers are special numbers that are designed to allow callers to reach certain numbers (often long-distance) without having to pay long-distance charges. These numbers are mostly used by companies who wish to allow their customers to call them for free no matter where they are located. There are several toll-free area codes, namely 800, 888, 877, 866, 855, 844 and 833. They all work the same way, but the choice of prefix depends on the businesses advertising strategy. Traditionally, 800 numbers have been used for television and radio advertisements, but other prefixes like 888, 866 and 855 are gaining popularity.

At NextelcoAI, a sub-account—also known as an extension—allows you to connect multiple devices to your main account so you can make and receive calls simultaneously. It can also be used as an internal extension for your office or home setup.

Many NextelcoAI features rely on sub-accounts for flexibility and scalability. Each sub-account is assigned a unique user ID and password, which are used to register and authenticate its dedicated VoIP device or devices.

At NextelcoAI, call queues are designed to efficiently manage incoming calls by placing callers in a queue until an available agent can assist them. You can enhance this setup by configuring an IVR for your DID number, allowing callers to hear a welcome message and navigate a menu before being directed to the appropriate queue.

Our Call Queue feature lets you customize the caller experience with pre-recorded messages, music, or promotional content while they wait. You can also choose from various ring strategies to control how calls are distributed among agents, including Ring All, Round Robin, Least Recent, Fewest Calls, and Random routing options.

At NextelcoAI, emergency 911 dialing is only supported within the United States and Canada. At this time, it is not available outside these regions. If you are traveling abroad, we strongly recommend using a traditional landline or a mobile phone to place emergency calls.

At NextelcoAI, forwarded calls are billed in two parts: inbound and outbound. The inbound portion is charged based on the billing plan selected for your DID number (either per-minute or flat rate). The outbound portion is billed according to the per-minute termination rates, depending on the destination of the forwarded call, and is charged for the same duration as the inbound segment.

At NextelcoAI, we offer a wide range of phone numbers across multiple area codes. You can easily browse and select available numbers through the Customer Portal. This is ideal for individuals who want to stay connected with friends or family in different cities without long-distance charges, as well as for businesses looking to establish a local presence in multiple locations.

At NextelcoAI, we support sub-accounts to help you manage and expand your setup more efficiently. Sub-accounts allow you to share your main account and use multiple devices, making your VoIP system more flexible and versatile.

At NextelcoAI, Caller ID Name (CNAM) is supported for calls within the United States and Canada, with some differences between regions. In the United States, inbound calls will display the caller’s name as long as it is registered in the CNAM database and the “Caller ID Name Lookup” feature is enabled on the receiving DID number. In Canada, CNAM works when a valid caller ID name is transmitted directly from the caller’s system.

Please note that CNAM is generally limited to calls within the United States and Canada and is not supported for international numbers.

At NextelcoAI, getting started with VoIP is simple. For basic use, you’ll need an IP phone, a softphone application, or a traditional phone connected through an ATA adapter. Since VoIP operates over the internet, a reliable high-speed internet connection is essential.

For business or company setups, you may require additional equipment such as an IP PBX system, multiple lines, routers, a virtual PRI, and a PBX server. If you’re using a softphone, you’ll also need a VoIP-compatible headset along with a computer or smartphone to make and receive calls effectively.

At NextelcoAI, VoIP technology allows you to use your phone just like a traditional landline—and much more. You can make and receive calls from anywhere in the world using devices such as laptops, smartphones, or tablets, all while keeping the same phone number and benefiting from lower call rates. The dialing process remains the same as with a regular phone.<br>
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One of the key advantages of VoIP is the ability to make free or low-cost calls through provider networks. You can access the NextelcoAI Customer Portal to view detailed rates for incoming and outgoing calls across Canada, the United States, and international destinations. For incoming DID numbers, we offer flexible pricing options, including flat monthly plans or per-minute rate plans.

At NextelcoAI, the Ring Group feature allows you to route incoming calls to multiple destinations at the same time, ensuring that any available member can answer the call. When a DID number is assigned to a Ring Group, all members will ring simultaneously until one of them picks up. You can include different types of members such as your main account, sub-accounts, SIP URIs, and call forwarding numbers. You can also choose which voicemail is used if no one answers. Each Ring Group supports up to 12 members, including up to 8 SIP, IAX2, or SIP URI entries and up to 4 call forwarding numbers.

At NextelcoAI, E911 service is available for US and Canadian DID numbers, including toll-free numbers from these regions. You can easily activate this feature through your Customer Portal by navigating to the E911 section within the DID numbers menu. For more details, please refer to our E911 guide.

At NextelcoAI, we provide support through a ticket system (email) and live chat to ensure efficient and thorough troubleshooting. At this time, technical support is not available over the phone.

At NextelcoAI, our referral program lets you earn account credits for every friend you refer. The more people you invite, the more credits you can accumulate. To receive your reward, your referral must sign up, add funds to their account, and complete their first call—after which the credits will be automatically added to your balance.

At NextelcoAI, our main offices are located in Montreal, QC, Canada. We also operate a technical site in Mérida, Yucatán, Mexico, to support the Latin American market.

At NextelcoAI, we offer audioconferencing services for our customers, complete with a dashboard that allows you to manage and record your conferences easily.

At NextelcoAI, we offer SMS services for a wide range of DID numbers across many cities in the United States and Canada. SMS can be accessed directly through the Customer Portal or via SIP protocol using compatible devices or software. For more information, please refer to our SMS guide.

At NextelcoAI, we do not currently offer a built-in calling card feature. However, you can create your own calling card solution using your system along with our DID numbers, provided they are on a per-minute rate plan. Additionally, we offer a DISA (Direct Inward System Access) feature, which allows you to set a number for our system to call, giving you a dial tone to place outgoing calls through the NextelcoAI network. This works similarly to a calling card and is especially useful for making long-distance calls when you’re outside your usual calling area or don’t have access to a VoIP device.

At NextelcoAI, we do not provide hardware or software for using our services. We operate on a BYOD (Bring Your Own Device) model, giving you the flexibility to choose and purchase the IP phone or equipment that best fits your needs. Unlike some providers that require specific devices, you are free to use any SIP-compatible device, including IP phones, from any communications equipment provider.

At NextelcoAI, CNAM (Caller ID Name) refers to the name displayed on the recipient’s phone when you place an outgoing call. For calls to Canadian numbers, the caller ID name can typically be sent directly from your device or system, as most support this feature. For calls to the United States, CNAM operates differently—it relies on a national database that matches phone numbers with registered names. We can assist with updating this database upon request. For more details, please refer to our Caller ID Name guide.

At NextelcoAI, Caller ID is a feature that allows the recipient of a call to see the caller’s phone number. In some cases, it can also display the caller’s name (e.g., John Smith). There are two types of Caller ID: Caller ID Number (CID) and Caller ID Name (CNAM). The availability of this information may vary depending on the caller’s location and the details registered with their service provider.

At NextelcoAI, we offer a variety of DID number types, primarily differentiated by their geographic coverage. The most commonly used options include local DIDs from the United States or Canada, international DIDs, and toll-free numbers. For more information on how to obtain a DID number and explore the different types available, please refer to our guide on ordering a DID number.

At NextelcoAI, there are no contracts or long-term commitments. You can open a free account at any time and use our services for as long as you wish, with complete flexibility.

At NextelcoAI, you can open an account for free directly through our website. Once your account is activated, you’ll be able to log in and access all available features and options. We also recommend reviewing our “Getting Started” guide to help you quickly set up and make the most of our services.

At NextelcoAI, we do not send paper invoices. You can access and review your invoices at any time by logging into your Customer Portal and navigating to Finances > Generate Invoice, where you’ll find all charges and account activity for your selected billing period.

At NextelcoAI, to start receiving incoming calls, you need to purchase a DID number through your Customer Portal or port an existing number from another provider. For numbers in the United States and Canada, we offer flexible plans, including a monthly flat rate or a per-minute option. Outgoing calls are billed on a per-minute basis, with rates varying depending on the destination. For a detailed breakdown of international rates, please refer to our Rates page.

At NextelcoAI, there are no “local” or “long-distance” distinctions for calls. All outgoing calls are billed based on the per-minute rate for the destination you are calling. Thanks to the benefits of VoIP technology, the rate remains the same for a given destination, regardless of where you are when you place the call.

At NextelcoAI, you can easily change the billing plan of your US and Canadian DID numbers at any time. This can be done directly through the Customer Portal, without the need to contact technical support.

At NextelcoAI, we do not charge any cancellation fees. You are free to cancel your account or phone number at any time, with no penalties or additional costs.

At NextelcoAI, the cost of our services depends on how you use them. For outbound calls, pricing is based on the per-minute rate for the destination and the applicable billing increment. For inbound calls, costs depend on your DID (phone number) rate plan, including any monthly fees and billing increments. Additional setup or monthly fees may apply depending on the services you choose. For a detailed breakdown of pricing, please refer to our Service Costs page.

At NextelcoAI, we offer multiple payment options for your convenience, including PayPal (no account required for guest credit card payments), Visa, MasterCard, and American Express. We also support bank wire transfers to our Montreal-based bank account. For more details regarding bank wire payments, please contact our Customer Support team.

At NextelcoAI, we follow a BYOD (Bring Your Own Device) approach, meaning you can use your own hardware without needing to purchase equipment from us. Most devices that support custom SIP configurations—such as smartphones, VoIP phones, ATA adapters, and PBX software or hardware—are fully compatible with NextelcoAI.

At NextelcoAI, a Direct Inward Dial (DID) number is a virtual phone number that functions just like a regular phone number, with the key difference that it is not tied to a traditional landline (POTS). Once your setup is complete, you can receive calls on your DID number from anywhere in the world, just like any standard phone number.

At NextelcoAI, customers located in Canada are required to pay applicable taxes based on their province. This includes GST (Goods and Services Tax) across Canada, PST (Provincial Sales Tax) for customers in Quebec, and HST (Harmonized Sales Tax) in provinces where it is applicable. These taxes apply to all payment methods, including PayPal and credit card transactions. For more information on how these taxes are applied, you can refer to general Canadian tax guidelines.

At NextelcoAI, we currently do not offer a dedicated test account or test number program. However, creating an account is completely free, and we provide free dialing codes so you can easily test the quality of our service. You can explore and try our available dialing codes to evaluate performance firsthand.

From the Customer Portal, go to the “DID Numbers” menu tab and then click “DID Billing”. From this page, you can cancel number(s). Please bear in mind that this process cannot be reversed, so be sure that you will no longer need the number.

We support audio codecs: G722, G729a, G711u (also known as uLaw or PCMU) and GSM. Their specifications are:

Codec : G.722
Bit Rate: 64 Kbps
Nominal Ethernet Bandwidth (Kilobits) : 87.2 Kbps

Codec : G.711u
Bit Rate: 64 Kbps
Nominal Ethernet Bandwidth (Kilobits) : 87.2 Kbps

Codec : G.729a
Bit Rate: 8 Kbps
Nominal Ethernet Bandwidth (Kilobits) : 31.2 Kbps

Codec : GSM
Bit Rate: 13 kbps
Nominal Ethernet Bandwidth (Kilobits) : 29.2 kbps

At NextelcoAI, you can create an unlimited number of voicemail mailboxes through the Customer Portal. Each mailbox can be assigned to a user and customized based on your preferences.

You can access and manage voicemail settings directly from the Customer Portal, from a device configured with NextelcoAI, or from any external phone by dialing * (star) after reaching your voicemail system.

At NextelcoAI, you can place calls to virtually any number worldwide, including mobile phones, landlines, and other VoIP numbers.

Yes, you can order a number from any available location, no matter where you are located. This number can be used anywhere in the world and will be considered local for the callers in the number’s area (i.e., a number from New York will be considered local for New York callers, even if you are physically located in Canada).

At NextelcoAI, we offer an Advanced Voicemail feature at no additional cost. You also have the option to receive your voicemail messages via email as attachments, making it easy to access and manage your messages from anywhere.

At NextelcoAI, we support DTMF signaling, including both In-Band DTMF and Out-of-Band signaling using the industry-standard RFC2833 specification.

The total number of voicemail messages allowed in a single mailbox is 100.

At NextelcoAI, there is no charge for changing your phone number. However, a standard setup fee applies when activating a new number. To get a new number, simply log in to your Customer Portal and browse available options in the “Order DID(s)” section.

The maximum length a voicemail message is three minutes

At NextelcoAI, most SIP-compatible software works seamlessly with our service. You can download these applications from their respective platforms, such as the iOS

With NextelcoAI, bursting allows your Virtual PRI to include a reserve pool of channels that stay inactive until your standard inbound channel capacity is fully utilized. When your regular PRI channels reach their limit, these additional channels automatically activate, ensuring your callers don’t encounter congestion or busy signals.

There are no fixed monthly fees for these reserve channels. Instead, NextelcoAI charges on a daily usage basis—only when the channels are activated, and only for the number of channels actually used.

Example: If your PRI includes 5 bursting reserve channels but you only use 1 of them during peak demand, you’ll be charged for just that 1 extra channel—and only for the day it was used.

On top of being highly flexible, there is no required equipment to have a virtual PRI configured with our service. Everything is managed directly from our system and you can request any change in the configuration to our team to match your needs.