SRTP config example for voip trunks

Answered Question
Apr 4th, 2010
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SRTP config example for voip  trunks

Correct Answer by William Bell about 7 years 4 weeks ago

MGCP doesn't fit your requirements but you could use h323. You would need to configure ipSec to support the call signaling (if you want) and SRTP to support the media. Here is a Cisco write up on Media and Signaling encryption for IOS gateways:


https://www.cisco.com/en/US/docs/ios/12_4t/12_4t11/htsecure.html



HTH.

Regards,

Bill

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Correct Answer
William Bell Sun, 04/04/2010 - 10:01
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MGCP doesn't fit your requirements but you could use h323. You would need to configure ipSec to support the call signaling (if you want) and SRTP to support the media. Here is a Cisco write up on Media and Signaling encryption for IOS gateways:


https://www.cisco.com/en/US/docs/ios/12_4t/12_4t11/htsecure.html



HTH.

Regards,

Bill

William Bell Sun, 04/04/2010 - 18:50
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I think that the original poster is looking for information on SRTP not SRST.

Marwan ALshawi Sun, 04/04/2010 - 18:57
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thanks for that

kursatcoban Thu, 05/20/2010 - 07:02
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Hi All ,


I found it , here is the sample config



voice-card 1
codec complexity high
local-bypass



conf t
voice service  voip
sip 
url sip
srtp negotiate cisco
exit
exit



conf t
dial-peer voice xxx voip
srtp
srtp system
security mode encrypted
exit


regards,


Kursat

xiangyong chu Tue, 12/21/2010 - 00:24
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Hi,


can i ask some question about the SRTP protocol?


1. how can i configure the SRTP protocol for bandwidth guarantee in QOS rules;

2. what is the SRTP port used?

3. what is the ios for the SRTP command in dial-peer?

Marwan ALshawi Sun, 04/04/2010 - 18:31
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if you use IPsec and you have any concern about QOS make sure to enable pre classify feature on the ipsec tunnel for QOS to make sure you keep the traffic marking and to avoid any qos issues



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