[SR-Users] IMS-P-CSCF: stripped down version of kamailio.cfg

Franz Edler franz.edler at technikum-wien.at
Sat Dec 12 21:19:41 CET 2015

Dear IMS-experts,

I am trying to reduce the complexity of the IMS implementation by disabling
the functions which are not required for a pure stripped down IMS core
Therefore I deactivate NAT handling, RTP proxy, SBC, dispatcher etc... in a
first step.
Later on I will add the functions step-by step. According to the

Now I discovered an inconsistency in the configuration file (kamilio.cfg) of
In main routing logic there is the point where P-CSCF distinguishes an
originating-initial request from a terminating-initial request. This is done
by the code:

	if (!ds_is_from_list()) {
		# Originating from Subscriber:
	} else {
		# Terminating to Subscriber:

Unfortunately the function ds_is_from_list() is part of the dispatcher
module which I want to avoid in a first step.
Therefore another criterion must be used to distinguish between originating-
and terminating-initial request.
I therefore propose to use the pseudo-user-name "term" in the Route-URI as a

What do you think?
I am actually thinking about the correct statement (regular expression) to
do that. Maybe anyone can help.

BR Franz

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