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SRTP master key determination is through configurations at the end points? or through SDP exchanges?

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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?

posted Jul 16, 2013 by Ashish Suchdev

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1 Answer

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Very old thread but let me try to answer it

SRTP master key is exchanged through SDP exchange. Follow the RFC 4568 to exchange the Master key b/w two parties. The Inline attribute 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
answer Jun 8, 2014 by anonymous
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