Troubleshooting

How SIPcity uses SIP OPTIONS messages to keep device registrations active.

Capture SIP signalling traffic to diagnose call failures and registration problems.

Common causes and fixes when a phone or softphone won’t register with SIPcity.

Use the HOMER platform to view and analyse detailed SIP traces for in-depth troubleshooting.

A reference guide to common SIP response codes and what each one means.

Diagnose and resolve problems with DTMF tone detection during calls.

What causes ghost or silent calls on VoIP systems and how to stop them.

Turn off RCS messaging on Android to prevent conflicts with the SIPcity app.

Remove a mobile number still associated with a previous iPhone so it can be used elsewhere.

The order in which SIPcity applies inbound call features, and how to adjust it.