Removing methods from Allow header
Hi,
We have some SIP UAs in our network that behave differently depending on what kind of methods are allowed by the Allow header in incoming (INVITE) messages. Since our SIP proxy is fully transparent this gives some interesting interworking situations depending on who's calling who.
Most of the problems come from our old PSTN gateway not announcing REFER method support in the Allow header and the new PSTN supplier via our NN3820 claiming support for REFER messages but not handling them correctly. So I want to remove the REFER support from messages entering our SIP network and recreating the old situation.