AudioCodes E-SBC User Manual

CHAPTER30 SBC Overview
Mediant 1000 Gateway & E-SBC | User's Manual
■ Restrict usage of specific fax coders to save bandwidth, enhance performance, or comply with
supported coders. These coders include G.711 (A-Law or Mu-Law), VBD (G.711 A-Law or
G.711 Mu-Law), and T38.
Fax configuration is done in the Coder Groups table and IP Profiles table. The Coder Groups table
defines the supported coders, which is assigned to the IP Profile associated with the SIP entity.
The IP Profiles table also defines the negotiation method used between the incoming and outgoing
fax legs, using the following fax-related parameters:
■ IPProfile_SBCFaxBehavior: defines the offer negotiation method - pass fax transparently,
negotiate fax according to fax settings in IP Profile, or enforce remote UA to first establish a
voice channel before fax negotiation.
■ IPProfile_SBCFaxCodersGroupName: defines the supported fax coders (from the Coder
Groups table).
■ IPProfile_SBCFaxOfferMode: determines the fax coders sent in the outgoing SDP offer.
■ IPProfile_SBCFaxAnswerMode: determines the fax coders sent in the outgoing SDP answer.
■ IPProfile_SBCRemoteRenegotiateOnFaxDetection: You can also configure the device to
detect for faxes (CNG tone) immediately after the establishment of a voice channel (i.e., after
200 OK) and within a user-defined interval. If detected, it can then handle the subsequent fax
renegotiation by sending re-INVITE messages to both SIP entities (originating and terminating
faxes). For more information, see the parameter in Configuring IP Profiles.
The voice-related coder configuration (Allowed and Extension coders) is independent of
the fax-related coder configuration, with the exception of the G.711 coder. If the G.711
coder is restricted by the Allowed Audio Coders Groups table, it is not used for fax
processing even if it is listed in the Coder Groups table for faxes. However, support for
G.711 coders for voice is not dependent upon which fax coders are listed in the Coder
Groups table.
Limiting SBC Call Duration
You can configure the maximum allowed call duration (in minutes) per SBC call. If an established
call reaches this user-defined limit, the device terminates the call. The feature ensures that calls
are properly terminated, allowing available resources for new calls. The following procedure
describes how to configure the feature for all calls (globally). To configure the feature per specific
calls, use IP Profiles (IpProfile_SBCMaxCallDuration).
➢ To configure maximum call duration:
1. Open the SBC General Settings page (Setup menu > Signaling & Media tab > SBC folder >
SBC General Settings).
2. In the 'Max Call Duration' field (SBCMaxCallDuration), enter the maximum call duration per
SBC call:
3. Click Apply.
SBC Authentication
The device can authenticate SIP servers and SBC users (clients). The different authentication
methods are described in the subsequent subsections.
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AudioCodes E-SBC Specifications

General

Brand	AudioCodes
Model	E-SBC
Category	Gateway
Language	English