On 10 Aug 2015, at 11:19, Jean-Marie Baran <jean-marie.baran@ama.bzh> wrote:

By the way, is it normal that I had to change the code to have Kamailio accept OPTIONS messages, or did I miss a config somewhere ?
It’s the normal way. You are in full control of handling of SIP messages - requests and responses. Nothing should happen magically in the background.

/O