Method to Convey Multiple SSRCs for a given stream

[kyzer-davis]

Need to provide context when multiple SSRCs are being multiplexed. Current text states to use EKT-SRTP for this but could be a solution available:

Solution A:

Multiple a=srtpctx lines each with a given identifier where the first number corresponds with the a=crypto tag and the second number corresponds with the multiplxed SSRC identifier

a=crypto:1 AES_CM_128_HMAC_SHA1_80 inline:d0RmdmcmVCspeEc3QGZiNWpVLFJhQX1cfHAwJSo
a=srtpctx:1:1 ssrc=0x01;roc=0x0;seq=0x1234
a=srtpctx:1:2 ssrc=0x02;roc=0x1;seq=0xABCD
a=srtpctx:1:3 ssrc=0x845fed;roc=0x0000;seq=unknown

Solution B:

Cram everything into one a=srtpctx line as a list and wrap each multiplexed item in parenthesis.

a=crypto:1 AES_CM_128_HMAC_SHA1_80 inline:d0RmdmcmVCspeEc3QGZiNWpVLFJhQX1cfHAwJSo
a=srtpctx:1 (ssrc=0x01;roc=0x0;seq=0x1234), (ssrc=0x02;roc=0x1;seq=0xABCD), (ssrc=0x845fed;roc=0x0000;seq=unknown)

[valvo27]

Solution A is cleaner and easier to read for humans.