Set up a SIP trunk
SIP trunks can be created and managed using the Infobip web interface and API. For background on trunk types, codecs, and billing plans, see What is SIP trunking.
When you create a static trunk, your telephony system must expose public, fixed IP addresses. The following schema helps to clarify what is meant by source IPs and destination IPs.
If a static SIP trunk definition does not include at least one source IP, then SIP traffic cannot be sent from your equipment to the Infobip infrastructure. Similarly, if a SIP trunk definition does not include at least one destination IP or FQDN, then incoming voice traffic to the Infobip platform cannot be forwarded over your SIP trunk.
For registered SIP trunks, make sure that your Private Branch Exchange (PBX) is compatible with registered trunks.
Using the Infobip web interface
SIP trunks are managed from the Infobip web interface.
Go to Channels and Numbers > Channels > Voice and WebRTC > SIP Trunking.
If you intend to create a trunk in one of the Infobip USA data centers and/or have your Place of Primary Use (PPU) in the United States, make sure that you declared a service address first (see Service addresses).
Choose the SIP trunk provider
Select CREATE SIP TRUNK and choose the type of trunk (trunk provider) you wish to provision. See Supported SIP trunk types and characteristics for more information.
For SIP trunks others than Infobip (that is, Freshworks, Genesys PureCloud, and so on), see Specific notes for provider trunks.
Choose plan and options
Choose between a Metered or Unlimited channel plan. For more information about these channel plans, see SIP trunk channels and related billing plans.
SIP trunk plans need to be activated on your account. If the plan selection is not available, contact your account manager or Support.
Select the number of required channels.
Main trunk settings
Follow the wizard to complete the SIP trunk details. Depending on the SIP trunk provider (INFOBIP, FRESHWORKS, and so on) and type (registered, static), the following fields may need to be completed:
| Parameter | Description | INFOBIP | FRESHWORKS |
|---|---|---|---|
| SIP trunk name | The name you wish to allocate to your new SIP trunk. This name is also used as a reference in your invoice. | X | X |
| SIP trunk type | Choose static or registered. See Supported SIP trunk types and characteristics to understand the differences between static and registered trunks. | X | |
| Datacenter location | Choose the Infobip data center in which the trunk is provisioned. | X | X |
| Service address | The service address or Place of Primary Use (PPU) for your SIP equipment. | X | X |
| TLS encryption | Enables you to choose between UDP (TLS disabled) or TLS/SRTP (TLS enabled). | X | |
| Codec | Add all of the CODECs you want to use on this SIP trunk. If you add multiple CODECs, you can order them into your preferred priority. | X | |
| DTMF | Select how DTMF transcoding will be handled. | X | |
| Fax | Specify your preferred protocol for the transmission of fax calls. | X | |
| Number format | Choose the numbering format you want for this trunk:
| X | |
| International calls | Choose whether to block or allow calling to international numbers on this trunk. A call is considered to be international when A and B numbers are from different countries. | X | X |
| SIP Options | Request Infobip to send SIP OPTIONS messages to your SIP equipment at a fixed interval of 60 seconds. Infobip always responds to incoming SIP OPTIONS requests with a 200 OK response. When SIP OPTIONS polling is enabled, Infobip sends OPTIONS requests toward your infrastructure to monitor trunk availability. If the polling detects that the trunk is out of service, this status is considered for call routing decisions. However, the OPTIONS status is not exposed in the Infobip web interface or through the SIP trunk status API. | X (static) | |
| Invite Challenge Authentication | When enabled, the platform performs an authentication challenge on each individual session. | X (registered) |
IP configuration
This configuration step appears only when configuring an INFOBIP static trunk.
Enter the list of source and destination IP addresses / FQDNs.
For destination IPs, if you do not have multiple redundant network elements, simply add your static IP, with the default SIP port of 5060. If you enter more than a single IP/FQDN, you can select the routing strategy to be applied:
- Failover: When sending calls to your SIP equipment, destination IPs are selected in the order they are configured. If the first IP is unavailable, the next IP is selected, and so on.
- Round robin: When sending calls to your SIP equipment, destination IPs are selected in sequential order and distributed evenly. Round robin is best used with symmetrical trunks (that is, trunks with the same capacity).
For source IPs, specify all the IP addresses from which your equipment sends traffic to the Infobip network. These can be different from the destination IPs.
Review order
Review all settings, then go on with the confirmation of the trunk creation. You can go back to previous steps if you wish to change any value.
When you select Pay now, your creation request is submitted to the Infobip system and a dialog displays the Infobip primary and backup SBC IP addresses (see SIP trunking redundancy). Safelist the Infobip SBC IP addresses on your infrastructure so that traffic can be processed on both sides. For registered trunks, this dialog also includes your username and password.
Make sure that you take note of your username and password and keep them in a safe place.
After you acknowledge this dialog, you are brought back to your list of SIP trunks. Monitor the Admin and Action status. See Understanding SIP trunk status.
Retrieving your authentication (registered trunks)
For registered trunks, the final dialog during trunk creation displays your username and password. If you lose your credentials or suspect they are compromised, reset them. From your SIP trunk list, select your registered trunk and select the Reset password button. A dialog displays both the username and a new password.
Using API
For more information about the API methods used for managing locations and SIP trunks, see Calls API platform (opens in a new tab).