AudioCodes Mediant 500L - Page 1207

Version 7.2 1207 Mediant 500L Gateway & E-SBC
User's Manual 69. Configuration Parameters Reference
Parameter Description
identified as fax calls. If a CNG tone is detected on the Tel
side of a Tel-to-IP call, the device adds the string, "FAX" as a
prefix to the destination number before routing and
manipulation. A routing rule in the Tel-to-IP Routing table
having the value "FAX" (case-sensitive) as the destination
number is then used to re-route the call to a fax destination
and the destination number manipulation mechanism is used
to remove the "FAX" prefix before sending the fax, if required.
If the initial INVITE used to establish the voice call (not fax)
was already sent, a CANCEL (if not connected yet) or a BYE
(if already connected) is sent to release the voice call.
 [0] Disable (default)
 [1] Rerouting without Delay = Upon detection of a CNG
tone, the device immediately releases the call of the initial
INVITE and then sends a new INVITE to a specific IP
Group or fax server according to the Tel-to-IP Routing
table. To enable this feature, set the CNGDetectorMode
parameter to 2 and the IsFaxUsed parameter to 1, 2, or 3.
 [2] Progress and Delay = Incoming ISDN calls are delayed
until a CNG tone detection or timeout, set by the
FaxReroutingDelay parameter. If the EnableComfortTone
parameter is set to 1, a Q.931 Progress message with
Protocol Discriminator set to 1 is sent to the PSTN and a
comfort tone is played accordingly to the PSTN. When the
timeout expires, the device sends an INVITE to a specific
IP Group or to a fax server, according to the Tel-to-IP
Routing table rules.
 [3] Connect and Delay = Incoming ISDN calls are delayed
until a CNG tone detection or timeout, set by the
FaxReroutingDelay parameter. A Q.931 Connect message
is sent to the PSTN. If the EnableComfortTone parameter
is set to 1, a comfort tone is played to the PSTN. When the
timeout expires, the device sends an INVITE to a specific
IP Group or to a fax server according to the Tel-to-IP
Routing table rules.
Note: The parameter has replaced the EnableFaxRerouting
parameter. For backward compatibility, the
EnableFaxRerouting parameter set to 1 is equivalent to the
FaxReroutingMode parameter set to 1.
[FaxReroutingDelay] Defines the maximum time interval (in seconds) that the
device waits for CNG detection before re-routing calls
identified as fax calls to fax destinations (terminating fax
machine).
The valid value range is 1-10. The default is 5.
Call Forking Parameters
Forking Handling Mode
forking-handling
[ForkingHandlingMode]
Determines how the device handles the receipt of multiple SIP
18x forking responses for Tel-to-IP calls. The forking 18x
response is the response with a different SIP to-tag than the
previous 18x response. These responses are typically
generated (initiated) by Proxy / Application servers that
perform call forking, sending the device's originating INVITE
(received from SIP clients) to several destinations, using the