Registration Restriction Control; Sbc Media Handling - AudioCodes Mediant 1000B User Manual

User's Manual

28.3.5 Registration Restriction Control

The device provides flexibility in controlling user registration:

Limiting Number of Registrations: You can limit the number of users that can
register with the device per IP Group and/or SRD. By default, no limitation exists for
registered users. This is configured in the SRD and IP Group tables.

Blocking Incoming Calls from Unregistered Users: You can block incoming calls
(INVITE requests) from unregistered users (pertaining to User-type IP Groups). By
default, calls from unregistered users are not blocked. This is configured in the SRD
table. The flowchart below depicts the process for blocking unregistered users. When
the call is rejected, the device sends a SIP 500 (Server Internal Error) response to the
remote end.
Figure 28-2: Blocking Incoming Calls from Unregistered Users
28.4

SBC Media Handling

Media behavior includes anything related to the establishment, management and
termination of media sessions within the SIP protocol. Media sessions are created using
the SIP "offer"/"answer" mechanism. If successful, the result is a bi-directional media (RTP)
flow (e.g. audio, fax, modem, DTMF). Each offer/answer may create more than one media
session of different types (e.g. audio and fax). In a SIP dialog, multiple offer/answer
transactions may occur, each may change the media sessions characteristics (e.g. IP
address, port, coders, media types, and RTP mode). The media capabilities exchanged in
an offer/answer transaction include the following:

Media types (Audio, Secure Audio, Video, Fax, Text...)
Version 6.8 489 Mediant 1000B Gateway & SBC
28. SBC Overview