Call hangs after 15 minutes

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Switch may not be responding to the SIP re-INVITE.

Some providers perform a SIP re-INVITE every 15 minutes for any active calls. It's a way of checking if the call is indeed still active. If an appropriate 200 OK is not received back, they disconnect the call.



POSSIBLE SOLUTIONS


Change Provider

Change Provider and check if issue is gone to confirm the origin of the problem.


Canreinvite setting

Set canreinvite to yes in the Device's Edit window.


Solve NAT issues

  • Make sure network is configured properly and all packets reach the Softswitch.
  • Do pcap capture and analyze the logs.
    • check the domain in the request URI
    • check if Pulic IP addresses are placed in SIP headers


Adjust session timers

In Device or Provider settings page you can change these parameters:

session-timers session-expires session-minse session-refresher

Check what settings User or Provider is requiring and set accordingly.


Disable session timers (not recommended)

In the general section in /etc/asterisk/sip.conf: session-timers=refuse

It can be done per Device in Device Settings page.

IMPORTANT: Drawback is that a call can show as going on forever if the BYE message is lost due to network problems.



See also