RTP Encryption

Unanswered Question
Apr 12th, 2010


I have been struggling to get his working ;

Our Setup is

PSTN terminated on Nortel.
SIP Trunk between Nortel and cisco .
SNOM SIP Phones terminated on Cisco CME Version 7.1

Cisco IP Phones are also terminated on Cisco CME.

When I enable "RTP Encryption:" on SNOM SIP Phone then voice works one-way

i.e for calls initiated from Snom to Cisco Phones ( both phones are configured on CME )

If calls are initiated from Cisco Phone to Snom Sip Phone then voice works perfectly.

If I disable "RTP Encryption:" then calls from PSTN to SNOM endpoints doesnt work, it rings with no voice.
If I press the hold key for 5 sec and release then voice starts working.

What tweak is needed on Cisco CME to get this working.



I have this problem too.
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tomfree_leo Mon, 04/12/2010 - 05:30


We got RTP issue too. SNOM IP PHONE didnt work with us, we are testing D-link IP Phones




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