IP-Phone to IP-Phone using sRTP

Answered Question
Jul 3rd, 2007

Guys,

I am not very experienced in the VoIP and Cisco Call manager world. Have never even seen one or set one up :)

But I have a question.

If you have the most basic of setups.

Cisco Call manager server and two IP phones.

A phone would register with the call manager, and stuff happens, then lets say, the two IP phones start talking directly to each other using RTP.

Can this be secured using sRTP in this 3 device example?

Ie, can you get all 3 devices to run sRTP?

Its a little confusing searching the web, as everytime sRTP is mentioned, it talks about routers and IOS?

One last point if I may: IPSec has nothing to do with this, and you can run sRTP independantly of IPsec. Would that be correct?

Cheers for the help guys,

Ken

I have this problem too.
0 votes
Correct Answer by gogasca about 9 years 5 months ago

YEs SRTP can be used between 2 IP Phones.

and yes Audio is between the 2 IP Phones directly.

IPSEC is used in CCM for IOS GW to IP Phone communication.

Check this:

http://www.cisco.com/univercd/cc/td/doc/product/voice/c_callmg/4_1/sec_vir/ae/sec413/secuphne.htm

***New feature***

http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/security/6_0_1/secugd/secuconf.html#wp1090249

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Correct Answer
gogasca Wed, 07/04/2007 - 21:09

YEs SRTP can be used between 2 IP Phones.

and yes Audio is between the 2 IP Phones directly.

IPSEC is used in CCM for IOS GW to IP Phone communication.

Check this:

http://www.cisco.com/univercd/cc/td/doc/product/voice/c_callmg/4_1/sec_vir/ae/sec413/secuphne.htm

***New feature***

http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/security/6_0_1/secugd/secuconf.html#wp1090249

kfarrington Wed, 07/04/2007 - 23:41

This is MOST helpful :))

is full sRTP available in CUCM v5?

Once again, many many thx

Ken

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