Configuring Rerouting Of Calls To Fax Destinations - AudioCodes Mediant 800 User Manual

CHAPTER 34 Routing SBC
Parameter

Configuring Rerouting of Calls to Fax Destinations

You can configure the device to reroute incoming SBC calls identified as fax calls to a new IP
destination. The device identifies a fax call if it detects, within a user-defined interval, a calling
(CNG) tone on the originator side (incoming IP leg). If the device detects a fax call, it terminates the
call and reroutes it using a new INVITE to the new fax destination (new IP Group). If the initial
INVITE that was used to establish the voice call was already sent, the 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).
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The following provides a basic example on how to configure fax rerouting.
➢
To configure fax rerouting:
1. Open the Fax/Modem/CID Settings page (Setup menu > Signaling & Media tab > Media
folder > Fax/Modem/CID Settings).
a. In the 'Fax Detection Timeout' field [SBCFaxDetectionTimeout], enter the duration (in
seconds) for which the device attempts to detect fax (CNG tone):
redirect(contact='...',response='<code>')
redirect(contact='sip:user@host')
Examples:
✔
redirect(response='300',contact='sip:102@host')
✔
redirect
(response='302',contact='sip:'+header.to.url.user+'@sipreco
rding.com')
You can use the built-in syntax editor to help you configure the field.
Click the Editor button located alongside the field to open the
Editor, and then simply follow the on-screen instructions.
Note:
■ The parameter can be used for normal and alternative routing.
■ The response code for redirect messages can only be 3xx.
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.
Mediant 800 Gateway & E-SBC | User's Manual
Description
The device responds to the dialog with a SIP 300 redirect
response that includes a contact value:
The device redirects the call from the sender to a SIP
Recording Server (SRS):
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