[SIPForum-discussion] SRTP master key determination is through configurations at the end points? or through SDP exchanges?

[Lokesh Reddy]

Hi Jones,

sRTP master key is exchanged through SDP exchange.  Follow the RFC 4568 to
excahnge the Master key b/w two parties. The Inline atytribute supports to
generate the Key.

Ex: Offer

Øv=0
Øo=sam 2890844526 2890842807 IN IP4 10.47.16.5
Øt=2873397496 2873404696
Øm=audio 49170 RTP/SAVP 0
Øc=IN IP4 168.2.17.12
Øa= sendrecv
Øa= 3ge2ae:requested
Ø a=crypto:1 AES_CM_128_HMAC_SHA1_80
inline:WVNfX19zZW1jdGwgKCkgewkyMjA7fQp9CnVubGVz


Regards,
Lokesh

On Tue, Jul 16, 2013 at 3:39 PM, Norah Jones <nh.jones01 at gmail.com> wrote:

> Hi,
>
> In case of a SRTP call setup through SIP session setup, is the master key
> exchanged between the two parties?
> or they have got their master keys through configuration and then use KDF
> to get the encryption keys for the session?
>
> Thanks,
> Norah Jones
>
>
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