[SR-Users] Kamailio ims nat issue: PRACK/ACK ruri changing in p-cscf

Owais Ahmad millennium.bug at gmail.com
Fri Sep 23 17:46:19 CEST 2016

Hi all,
My scenario is as follows:
I have All the CSCFs on the same IP using different ports.
P-CSCF advertises a public IP. Rest of the nodes including I-CSCF and
S-CSCF listen local only.

Behavior: When an ACK or PRACK goes from P-CSCF to S-CSCF, the RURI changes
such that alias parameter is removed.
Hence, P-CSCF ends up sending PRACK and ACK on private IP of UE.

Here's what the config looks like:

listen=udp:lo.ca.l.ip:6000 advertise pu.bl.ic.ip:6000

#!define WITH_NAT

Any hints?
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