Dear list,
I'm running kamailio-4.2.3-3.1.x86_64 in a very simple setup: one
Asterisk server behind kamailio. But I'm using dispatcher, the other
servers are just down currently. :)
Different vendors route DIDs to kamailio's IP and kamailio handles the
communication towards Asterisk.
Now I have a new vendor who uses MetaSwitch, and there is a problem. All
calls get dropped with a BYE from the Asterisk side after 32 seconds
because Asterisk never receives the ACK, because kamailio doesn't
forward it, because MetaSwitch sends it as
ACK sip:number@KAMAILIO-IP
instead of
ACK sip:number@ASTERISK-IP
That means MetaSwitch ignores what we tell it in the Contact: header.
Is this MetaSwitch'es "fault" or kamailio's? All other vendors work fine
without problems. Therefore I have compared an "old" vendor and the new
one. Here is the result that shows the difference:
Old vendor - works:
OLDVENDOR-IP.5060 > KAMAILIO-IP.5060: INVITE sip:number@KAMAILIO-IP
KAMAILIO-IP.5060 > OLDVENDOR-IP.5060: SIP/2.0 100 trying
KAMAILIO-IP.5060 > ASTERISK-IP.5060: INVITE sip:number@KAMAILIO-IP
ASTERISK-IP.5060 > KAMAILIO-IP.5060: SIP/2.0 100 Trying
ASTERISK-IP.5060 > KAMAILIO-IP.5060: SIP/2.0 200 OK
KAMAILIO-IP.5060 > OLDVENDOR-IP.5060: SIP/2.0 200 OK
OLDVENDOR-IP.5060 > KAMAILIO-IP.5060: ACK sip:number@ASTERISK-IP:5060
KAMAILIO-IP.5060 > ASTERISK-IP.5060: ACK sip:number@ASTERISK-IP:5060
New vendor with MetaSwitch - doesn't work:
NEWVENDOR-IP.5060 > KAMAILIO-IP.5060: INVITE sip:number@KAMAILIO-IP:5060
KAMAILIO-IP.5060 > NEWVENDOR-IP.5060: SIP/2.0 100 trying
KAMAILIO-IP.5060 > ASTERISK-IP.5060: INVITE sip:number@KAMAILIO-IP:5060
ASTERISK-IP.5060 > KAMAILIO-IP.5060: SIP/2.0 100 Trying
ASTERISK-IP.5060 > KAMAILIO-IP.5060: SIP/2.0 200 OK
KAMAILIO-IP.5060 > NEWVENDOR-IP.5060: SIP/2.0 200 OK
NEWVENDOR-IP.5060 > KAMAILIO-IP.5060: ACK sip:number@KAMAILIO-IP:5060
ASTERISK-IP.5060 > KAMAILIO-IP.5060: SIP/2.0 200 OK
KAMAILIO-IP.5060 > NEWVENDOR-IP.5060: SIP/2.0 200 OK
NEWVENDOR-IP.5060 > KAMAILIO-IP.5060: ACK sip:number@KAMAILIO-IP:5060
ASTERISK-IP.5060 > KAMAILIO-IP.5060: SIP/2.0 200 OK
KAMAILIO-IP.5060 > NEWVENDOR-IP.5060: SIP/2.0 200 OK
NEWVENDOR-IP.5060 > KAMAILIO-IP.5060: ACK sip:number@KAMAILIO-IP:5060
... and so on ...
Can I do something about this or is a change on MetaSwitch'es side in order?
Thank you!
Markus
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