Hello all,

SIP/UE (boghe or imsdroid) client registered to Kamailio makes call to an 
Asterisk registered SIP phone is successful:
[UE]-Kamailio--->INVITE--->Asterisk16-[phone]
[UE]-Kamailio--->200 OK with to_tag--->Asterisk16-[phone]

But in reverse direction for a call, Kamailio does not return the SIP OK so no 
to_tag is sent so call fails to ring and complete:
[phone]-Asterisk16 --->INVITE--->Kamailio

Where the UE device never receives the INVITE, Asterisk never gets and 200 OK 
message with the to_tag from the I-CSCF, the call flow itself gets lost in 
Kamailio, where the P-CSCF sends final INVITE to I-CSCF and and ultimately a 
604 HSS user unknown message is sent back to Asterisk from the I-CSCF.

Basically Im using the default "sample" configs for both the P and the I-CSCF.  
Our sauce is in the S-CSCF for out going calls that originate by a registered 
UE.

Any insight or sample Kamailio configuration that Im lacking?
Has anyone done this and could share the asterisk and Kamailio script snippets 
that make it possible.

Thanks,
_Martin
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