User`s manual

Mediant 1000
H.323 User's Manual 24 Document #: LTRT-83401
1.1.3 H.323 Features
The Mediant 1000 H.323 gateway is built on and implements the RadVision™ H.323
version 4.2 protocol stack. The gateway complies with H.323 Version 4.0 ITU standard,
H.245 Version 10 and H.225 Version 4.
1.1.3.1 Gatekeeper
 Registers to known Gatekeeper.
 Supports Gatekeeper registration with prefixes.
 Supports sending of Unregister request before reset.
 Uses routed or direct mode calls.
 Supports the Alternative Gatekeepers mechanism, used to obtain the IP addresses of
alternative Gatekeepers.
 Uses redundant Gatekeepers (if redundant Gatekeepers are defined).
 Supports Automatic Gatekeeper Discovery (using IP Multicast).
 Works also without a Gatekeeper using the internal routing table with or without dialing
plan rules.
 Can fallback to internal routing table if there is no communication with the
Gatekeepers.
 Supports the "TimeToLive" parameter. The gateway sends Registration requests up to
"TimeToLive" expiration.
 Supports Info Request Response (IRR) messages for KeepAlive.
 Supports the mapping of destination (Alias) numbers in ACF message by the
Gatekeeper.
 Supports Gatekeeper ID configuration (per Gatekeeper IP) for different Gatekeepers.
 Supports Lightweight Registration.
 Supports RAI (Resource Available Indication) messages, informing Gatekeeper that
the gateway’s resources are below a threshold.
 Supports registration types: E.164, H323-ID and PartyNumber.
 Supports Pre-granted ARQ.
 Supports H.235 Security, Annex D Procedure 1 (authentication with a Gatekeeper).
1.1.3.2 Call Setup
 Can use the Normal Connect procedure.
 Can use the Fast Connect procedure with or without immediately opening H.245
channel.
 Can use Tunneling.
 Can negotiate a coder from a list of given coders for Normal or Fast Connect
procedures.
 Can open an H.245 channel when using Fast Connect.
 Supports Early H.245 procedure, enabling opening of an H.245 channel before a
Connect message is received. Can be used for sending out-of-band DTMF digits
before a call is answered.
 Can represent SourceNumber and DestinationNumber through: E.164, H323-ID and
PartyNumber.
 Can configure (in the manipulation tables) or map (according to H.225 V.4 Table 18)
the representation of the Src/Dest number types in H.323 messages.