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lprogress
2011 Jun 27
0
Question regarding progressinband
...in the sip
protocol in Asterisk - the option progressinband.
When this option is set to yes in asterisk version 1.4.21.1 - the call flow is:
sip.conf:
progressinband=yes
Device Asterisk
-----------INVITE SDP--------->
<---------100 Trying------------
<-----183 Session Prgoress--
After version 1.4.2X+ (tested with 1.4.36/1.4.41.1) the call flow changes to:
Device Asterisk
-----------INVITE SDP--------->
<---------100 Trying------------
<---------180 Ringing----------
<-----183 Session Prgoress--