Carrier or registration
Unstable SIP, channel limits, response codes, or a carrier-side change.
Telephony problems
Inbound or outbound Asterisk calls are not connecting
We correlate the SIP trace, route, queue, and network to find the cause of failed, dropped, or one-way calls.
- SIP errors
- Dropped calls
- Routing
SIPsignaling and response codes
Routerules and priorities
Traceevidence over guesswork
Possible causes
The fault may not be where it appears
A random configuration change often only moves the problem.
Dialplan and queues
Conflicting routes, timeouts, wrong rule order, or an IVR dead end.
Network and NAT
External address changes, firewall rules, session timeouts, or asymmetric routing.
Diagnosis
From evidence to a verified fix
We check each stage and narrow the problem to one component.
Reproduce
We capture the number, time, direction, and exact failure scenario.
Correlate
We compare the SIP trace, logs, queue state, and network.
Fix
We make the smallest effective change, retest, and add monitoring.
FAQ
Frequently asked questions
Short answers before work begins.
What should we prepare for diagnosis?
Example numbers, exact timestamps, call direction, expected behavior, and log access.
Why might inbound calls fail?
The cause may be SIP trunk registration, routing, context, DID mapping, a queue or IVR branch, firewall rules, or provider-side settings. We identify it from a specific call example.
Why might outbound calls fail?
We inspect dialing rules, the outbound route, extension permissions, number formatting, trunk state, and the SIP provider response.
Is Asterisk always the cause?
No. The source may be the carrier, network, NAT, firewall, agent phone, or an integration.
Can this be fixed without stopping the contact center?
Often yes. We prepare changes with the smallest risk window and a rollback plan.
Next step
Have inbound, outbound, or specific routes stopped working?
Include example numbers, exact timestamps, and call direction so diagnosis can begin with evidence.