SIP 408 Request Timeout
AsteriskRFC 3261 §21.4.9The server didn't get a response within the SIP transaction timeout (Timer B = 32s for INVITE). Usually a routing or downstream issue.
Common causes on Asterisk
- One-way SIP signaling (firewall blocking returning packets)
- Downstream gateway down or in maintenance
- Mis-routed in dial plan to an unreachable peer
Stop guessing — paste your trace
Drop your PCAP or sngrep log and SIP Flow will render the ladder, surface the failing transaction, and (optionally) ask Gemini to suggest the fix grounded in Asterisk docs.
Open analyzerDon't have a trace yet? See how to capture one in Wireshark, sngrep, or your PBX