How to overcome a situation where SIP cal...

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 348136

Description

This article describes the reason why SIP calls are disconnected within 30 seconds after being answered

Scope

FortiGate.

Solution

SIP calls getting disconnected within 30 seconds after being answered is a symptom that the 3-way handshake for the INVITE/call establishment (INVITE/200 OK(INVITE)/ACK) did not complete and that the remote party did not receive the ACK packet in within 30 seconds after sending the 200 OK message - the remote party is the one disconnecting the calls.

This issue is not a FortiGate issue.

For outbound calls, the issue needs to be analyzed on the internal PBX/Phone side.
For inbound calls, the issue needs to be analyzed on the remote PBX or VoIP provider's side.

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Troubleshooting Tip: How to overcome a situation where SIP calls are disconnected within 30 seconds after being answered

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