Many IP-PBX's cannot be configured to register/login to 2talk as a client, so for these types of devices SIP Peering is the only way you can interconnect with 2talk. SIP Peering has many other benefits over a dynamic registration including:
- Your device does not need to be logged in or registered, so calls will always be routed to your IP-PBX. This means that if your internet connection was reset or went down temporarily you would start receiving calls immediately once your internet connection comes back up (instead of having to wait for a re-registration or login)
- You can route all your numbers easily to your IP-PBX with no further configuration required. If you add more numbers to your account then they will automatically be routed down your trunk.
- You save bandwidth since there is no need for SIP registrations or 'polling' traffic usually sent to devices that are behind NAT.
- Peering SIP Trunks have the concept of a 'pilot' number. You can present any caller ID number down your trunk and if it is not recognised as being on your account then the caller ID will be set to the trunk number. This makes configuration simpler and avoids outbound calls ever being rejected.