We have a call manager 4.1.3 with sccp ip phones.
We have also a SIP gateway (AudioCodes Media 2000) that connects our lab to the PSTN.
We created a SIP trunk between the CCM and the SIP Gateway, but we didn't manage to have people from the PSTN calling the SCCP IP phones (we have a "SIP 404 Not Found" response from the ccm.)
Calling from the IP Phones to the PSTN is working fine.
So i'd like to know if for this kind of scenarii (with ccm 4.1.3) a sip proxy-server is mandatory between the CCM and the SIP gateway.
Thanks in advance.