How to resolve a situation where a SIP ca...

FortiGate

FortiGate Next Generation Firewall utilizes purpose-built security processors and threat intelligence security services from FortiGuard labs to deliver top-rated protection and high performance, including encrypted traffic.

Article Id 360230

Description

This article describes how to resolve a situation where SIP calls between branches connected through IPsec have no audio, but calls from branches to the main office (and vice-versa) work fine.

Scope

FortiGate, IPsec.

Solution

SIP calls between branches with no audio, while calls from branches to the main office (and vice-versa) work fine is a common symptom of a VoIP/SIP implementation where direct media is configured on the main office PBX.

Solution 1:

Disable direct media on the PBX configuration in order to have the audio packets flowing via PBX.

Solution 2:

Reconfigure the IPsec phase-2 selectors for all IPsec tunnels towards the Branches so that for each Branch, all of the other branch networks are considered as main office networks.

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Troubleshooting Tip: How to resolve a situation where a SIP calls between branches have no audio

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