A-9
Cisco SIP IP Phone Administrator Guide
Appendix A SIP Compliance with RFC 3261 Information
Transport Layer Protocols
Transport Layer Protocols
SIP Security
Authentication
SIP DNS Records Usage
SIP DTMF Digit Transport
m—Media name and transport
address
Yes
a—Media attribute lines
Yes
Protocol
Supported?
Unicast UDP
Yes
Multicast UDP
No
TCP
No
Basic Authentication
No
Digest Authentication
Yes
Proxy Authentication
No
PGP
No
DNS Resource Record Type
Supported?
Type A
Yes
Type SRV
Yes
Transport Type
Supported?
RFC 2833
Yes
In-band tones
Yes
SDP Headers
Supported?