prefixkit Ask an engineerAsk RU

Q.850 causes

Q.850 cause 31: Normal, unspecified

Normal, unspecified: the call ended for a normal reason that does not fit another cause. Often used as a catch-all.

31
Q.850 name
Normal, unspecified
Group
Normal events
FreeSWITCH
NORMAL_UNSPECIFIED
Asterisk
HANGUPCAUSE=31
SIP response from a gateway
480 Temporarily Unavailable
In SIP
Reason: Q.850;cause=31

Why it happens

What to check

More tools: voip & telephony

AI voice agent cost newRetell, ElevenLabs, Vapi, Bland vs human agents.AI agent ↔ PBX over SIP newAsterisk and FreeSWITCH configs for AI agents.VoIP pcap analyzerCalls, voice quality and why they dropped.SIP log analyzerLadder, SDP, NAT, DTMF and STIR/SHAKEN from a log.SIP server checkSRV, TCP/TLS and a SIP OPTIONS ping.SIP trunk generator newAsterisk pjsip.conf, FreeSWITCH gateway, Kamailio.Dialplan pattern tester newWhich Asterisk or FreeSWITCH rule a number hits.IVR builder newVoice menu and hours for Asterisk and FreeSWITCH.PBX audio converter newPrompts to 8 kHz WAV, A-law, µ-law; TTS.STIR/SHAKEN decoder newIdentity header: attestation, numbers, checks.VoIP quality test (UDP) newLoss, jitter, MOS and bufferbloat like a real call.MOS calculatorVoice quality from delay, jitter and loss.VoIP bandwidthBandwidth per call with all headers and VPN.Erlang B & CTrunk channels and call-centre agents needed.SIP response codesWhat every code means and what to check.Q.850 causesCall release causes and their SIP mapping.