We got CME running on 2800 router and SIP Phones (SNOM) ; calls from pstn to sip endpoints rings with no voice, clicking on hold key for 5 sec and releasing makes the call to work. If the endpoint is Cisco Phone is works great.
Calling extension to extension between SIP and SCCP works ( SIP : Snom & Sccp : Cisco IP Phone )
SIP to SIP extension works with SNOM phones.
Any idea what could be the issue.
Cisco Unified Communications Manager Express : Version 7.0(0)
Snom Phone Model : SNOM 870
On Phone : RTP Encryption is off
tested codec are G711u / G711a / G729AB
Enable hook flash: Enable