RECOVERY_TIME_EXPIRE
This means the 5 second timer in which we expect to receive a call INVITE SIP response from the end device expired.
In such a case we will try to reroute the call to the set fallback route (if any), such as voicemail or Find Me / Follow Me.
Usual reasons for such an error
Section titled “Usual reasons for such an error”- Call INVITEs do not reach the device due to temporarily lost internet connectivity.
- Blocking of signaling to the IAD by a firewall.
- Temporary shutdown of the end device (power lost).
- Enabled NAT traversal technique that might overwrite or modify SIP headers — see detecting and disabling SIP ALG.
- Too short UDP timeout on the firewall — should be at least 120 seconds.
- Disabled Consistent NAT.
- Disabled “NAT Keep Alive” or “NAT Mapping”.
If you are experiencing one-way audio, see our article on troubleshooting one-way audio.