Version 7.2 723 Mediant 800B Gateway & E-SBC
User's Manual 34. Routing SBC
device sends a CANCEL (if not connected yet) or a BYE (if already connected) to release
the call (with the internal disconnect reason RELEASE_BECAUSE_FAX_REROUTING,
translated to Q.850 reason GWAPP_NORMAL_UNSPECIFIED 31).
Note:
• You must configure the originating fax to use the G.711 coder.
• If the remote side replies with T.38 or G.711 VBD, fax rerouting is not done.
• If both fax rerouting and fax re-INVITE are configured, only fax rerouting is done.
The following procedure describes how to configure fax rerouting, using an example
consisting of three IP Groups.
 To configure fax rerouting:
1. Configure the fax detection interval:
d. Open the Fax/Modem/CID Settings page (Setup menu > Signaling & Media tab
> Media folder > Fax/Modem/CID Settings).
e. In the 'Fax Detection Timeout' field (SBCFaxDetectionTimeout), enter the
duration (in seconds) for which the device attempts to detect fax (CNG tone):
2. Configure three IP Groups in the IP Groups table (see Configuring IP Groups on page
365):
• IP Group #0 "HQ": This is the source IP Group, sending voice calls and fax calls.
• IP Group #1 "Voice": This is the destination for voice calls sent from IP Group #0.
• IP Group #2 "Fax": This is the destination for fax calls sent from IP Group #0.
3. For the fax destination (IP Group #2), do the following:
f. Configure a Coder Group with T.38, which allows fax transmission over IP (see
Configuring Coder Groups on page 427).
g. Configure an IP Profile (see Configuring IP Profiles on page 436):
♦ Assign it the Coder Group.
♦ Configure the 'Fax Rerouting Mode' parameter to Rerouting without delay:
h. Assign the IP Profile to IP Group#2.
4. Configure two adjacent IP-to-IP Routing rules in the IP-to-IP Routing table (see
Configuring SBC IP-to-IP Routing Rules on page 709):
• IP-to-IP Routing Rule #0 - routes voice calls from IP Group #0 to IP Group #1:
Match
Source IP Group HQ (IP Group #0)
Call Trigger
Initial Only
ReRoute IP Group Voice (IP Group #1)
Action
Destination Type
IP Group
Destination IP Group Voice (IP Group #1)
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