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Ring - No Voice , HoldKey

Hello

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.

config  detals

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

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