Review SIP and media boundaries after voice-system changes
A monthly review of SIP transports, media routes and recent configuration changes for a VoIP service.
From the blog
Deployment & Operations
Practical observations from planning, deploying, testing, monitoring, and operating business phone systems.
Trace a VoIP protocol failure across signalling and media
Collect a failed and a successful call trace at the same boundary to locate a SIP or media-path failure.
Check a VoIP protocol change before rollout
Identify the signalling and media paths affected by a VoIP protocol change, then agree on a safe test and rollback.
Review codec policy and transcoding load
Check whether the live codec policy still matches endpoints, trunks, bandwidth and transcoding capacity.
Find the codec negotiated on a failed or poor-quality call
Use SIP and media evidence to distinguish codec negotiation faults from packet loss or delay.
Check codec settings before changing a call path
Review codec support, packet timing and bandwidth assumptions before changing a voice service.
Review international dial routes and destination controls
Check international prefix rules, carrier permissions and recent call records against the approved dial plan.
Trace an international call that fails or reaches the wrong number
Compare dialled digits, rewritten digits and carrier responses to diagnose an international calling fault.
Check an international dialling change against real routes
Test prefix stripping, country codes and caller ID before changing an international dial plan.
Review addressing and name resolution for voice devices
Check whether voice VLAN, DHCP, DNS and route records still match the working network.
Collect network evidence when phones lose service
Compare a failing phone with a working one across addressing, name resolution, routing and call traffic.
Check the voice network before an IP change
Record addressing, VLAN, DHCP, DNS and routing dependencies before changing a voice network.