After some testing I have found another SIP client, which shoud be used for SIP over IPv6 testing. The first one is Linhpone and the second one is IMS Boghe client. Right, Boghe is mainly IMS client, but may be used as an IETF SIP client, which allows to register and use an IETF SIP based network.
To make it working using IPv6 you have to change the following. Start the client and from the main menu choose Tools and Options.
In present days (start of the 2011) is not so easy to find SIP client which correctly support the using of IPv6. Up to now, with thanks of kamailio usr list, I found only one softphone and it is Linphone. It is quite simple softphone, but for IPv6 testing it is still enough.
To configure Linphone using IPv6 we have to change following:
http://tools.ietf.org/html/rfc5118
Kamailio 3.0 provides a command line interface: sercmd. Sercmd allows to connect to running instance of Kamailio, either on same or remote system.
If we like to use it, we have to first enable the ctl module in kamailio.cfg.
To create a new user to existing IMS domain we will use web interface of the HSS. So navigate your browser to your HSS, in my case
https://hss.ims1.sip.uniza.sk/
Creating IMS Subscription (IMSU)
Choose User identities from upper menu,
In this article we extend the Kamailio IMS platform (as described here) with the NAT traversal capabilities with the help of the PCSCF and RTPproxy server. The RTPproxy will be installed on the same machine as the PCSCF is running. From the performance point of view you may install rtpproxy on any machine which is reachable over IP.
Installing RTPproxy server
In this article we describe how to extend the base Kamailio IMS platform (as is described here) with simple presence service realized over Kamailio SIP server.