Troubleshooting Tip: How to resolve a situation where a SIP calls between branches have no audio
| 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.
Related article: Technical Tip: VoIP and SIP configuration and troubleshooting resource lists |