3Com V7122 User Manual page 26

Early Media (supporting 183 Session Progress).
PRACK reliable provisional responses (RFC 3262).
Call Hold and Transfer Supplementary services using REFER, Refer-To, Referred-By,
Replaces and NOTIFY messages.
Supports RFC 3711, Secured RTP and Key Exchange according to <draft-ietf-mmusic-
sdescriptions-12>.
Supports RFC 3489, Simple Traversal of UDP Through NATs (STUN).
Supports RFC 3327, Adding 'Path' to Supported header.
Supports RFC 3581, Symmetric Response Routing.
Supports RFC 3326, Reason header.
Supports RFC 4028, Session Timers in SIP.
Locating SIP Servers (RFC 3263).
An Offer/Answer Model with Session Description Protocol (SDP) (RFC 3264).
Supports network asserted identity and privacy (RFC 3325 and RFC 3323).
Supports Tel URI (Uniform Resource Identifier) according to RFC 2806 bis.
Remote party ID <draft-ietf-sip-privacy-04.txt>.
Supports obtaining Proxy Domain Name(s) from DHCP (Dynamic Host Control Protocol)
according to RFC 3361.
RFC 2833 Relay for Dual Tone Multi Frequency (DTMF) digits, including payload type
negotiation.
DTMF out-of-band transfer using:
INFO method <draft-choudhuri-sip-info-digit-00.txt>
NOTIFY method <draft-mahy-sipping-signaled-digits-01.txt>.
SIP URI: sip:"phone number"@IP address (such as 1225556@10.1.2.4, where "122556"
is the phone number of the source or destination) or sip:"phone_number"@"domain
name", such as 122556@myproxy.com. Note that the SIP URI host name can be
configured differently per called number.
Supports RFC 4040, RTP payload format for a 64 kbit/s transparent data.
Can negotiate coder from a list of given coders.
Responds to OPTIONS messages both outside a SIP dialog and in mid-call. Generates
SIP OPTIONS messages as Proxy keep-alive mechanism.
Representing trunk groups in tel/sip Uniform Resource Identifiers (URIs) according to
<draft-ietf-iptel-trunk-group-04>.
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V7122 GatewayUser Guide