Howto:How to Connect to a VoIP Provider

Work in progress!

Abstract

This document is intended to help you to connect your innovaphone PBX to a VoIP provider.

Gateway Interfaces

Most of the VoIP providers require a registration to make and receive calls. If no registration is required the VoIP provider needs to know your ip address in order to send calls to you.

• Select a VOIP interface (Gateway/VOIP)
• Give it a descriptive name (e.g. name of your VOIP provider)
• Select the VOIP protocol (SIP/H.323)
• Select interface type "Gateway without Registration" if registration is required. Select interface type "Register as Endpoint/Gateway" if registration is not required.

SIP provider

• Enter the providers domain name in "Domain"
• In case the domain name of the SIP provider cannot be resolved by DNS, you must enter the providers IP address into "Server Address"
• For registration interfaces you must enter the registration ID into the "Alias List" (not required for interfaces without registration)
• If authorization is required by the SIP provider, enter the username and password in the "Authorization" section. In most cases the authentication username is identical to the registration ID.

H.323 provider

To do ...

NAT problems

The PBX as well as the Gateway are working in transit mode. This means RTP addresses going to be exchanged between the communication endpoints. If calls are established between internal endpoints (with private IP addresses) and the VoIP provider (with public IP addresses) in transit mode the private RTP addresses will be announced to the VoIP provider. A VoIP provider cannot send to private RTP addresses!

A Media-Relay functionality has been implemented to get RTP working in this scenario.