Call hangs after 15 minutes

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

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

Increase session timers

Add in /etc/asterisk/sip.conf [general] section:

session-timers=originate session-expires=10800 session-minse=300 session-refresher=uas

And restart Asterisk.

Disable session timers (not recommended)

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

See also

• Session Timers in the Session Initiation Protocol (SIP) RFC 4028