Important RFCs
SIP
Reference: http://tools.ietf.org/html/rfc3261
Valuable updates and extensions:
SIP Re-INVITE: http://tools.ietf.org/html/rfc6141
ICE
Reference: http://tools.ietf.org/html/rfc5245
ICE TCP
Reference: http://tools.ietf.org/html/rfc6544
SDP
Reference: http://tools.ietf.org/html/rfc4566
How to use SDP: http://tools.ietf.org/html/rfc3264 Valuable updates and extensions:
SDP and IPv6: http://tools.ietf.org/html/rfc6157
SDP for SRTP: http://tools.ietf.org/html/rfc4568
RTP
Reference: http://tools.ietf.org/html/rfc3550
Valuable updates and extensions:
RTP and RTCP on same port: http://tools.ietf.org/html/rfc5761
SRTP
Reference: http://tools.ietf.org/html/rfc3711
Valuable updates and extensions:
DTLS for SRTP: https://tools.ietf.org/html/rfc5763 et http://tools.ietf.org/html/rfc5764
AES-192 and AES-256: https://tools.ietf.org/html/rfc6188
AES-GCM: https://tools.ietf.org/html/rfc7714