AudioCodes Mediant 1000B User Manual page 916

Parameter
Web/EMS: Min Routing
Overlap Digits
CLI: min-dg-b4-routing
[MinOverlapDigitsForRouting
]
Web/EMS: ISDN Overlap IP to
Tel Dialing
CLI: isdn-tx-overlap
[ISDNTxOverlap]
Web: Enable Receiving of
Overlap Dialing
CLI: ovrlp-rcving-type
[ISDNRxOverlap_x]
User's Manual
message.
Defines the minimum number of overlap digits to collect (for ISDN
overlap dialing) before sending the first SIP message for routing
Tel-to-IP calls.
The valid value range is 0 to 49. The default is 1.
Note: This parameter is applicable when the ISDNRxOverlap
parameter is set to [2].
Enables ISDN overlap dialing for IP-to-Tel calls. This feature is part
of ISDN-to-SIP overlap dialing according to RFC 3578.

[0] Disable (default)

[1] Enable
When enabled, for each received INVITE of the same dialog
session, the device sends an ISDN Setup (and subsequent ISDN
Info Q.931 messages) with the collected digits to the Tel side. For
all subsequent INVITEs received, the device sends a SIP 484
Address Incomplete response in order to maintain the current dialog
session and receive additional digits from subsequent INVITEs.
Note: When IP-to-Tel overlap dialing is enabled, to send ISDN
Setup messages without the Sending Complete IE, the
ISDNOutCallsBehavior parameter must be set to USER SENDING
COMPLETE (2).
Determines the receiving (Rx) type of ISDN overlap dialing for Tel-
to-IP calls, per trunk.

[0] None = (Default) Disabled.

[1] Local receiving = ISDN Overlap Dialing - the complete
number is sent in the INVITE Request-URI user part. The device
receives ISDN called number that is sent in the 'Overlap' mode.
The ISDN Setup message is sent to IP only after the number
(including the Sending Complete IE) is fully received (via Setup
and/or subsequent Info Q.931 messages). In other words, the
device waits until it has received all the ISDN signaling
messages containing parts of the called number, and only then it
sends a SIP INVITE with the entire called number in the
Request-URI.

[2] Through SIP = Interworking of ISDN Overlap Dialing to SIP,
based on RFC 3578. The device interworks ISDN to SIP by
sending digits each time they are received (from Setup and
subsequent Info Q.931 messages) to the IP, using subsequent
SIP INVITE messages.
Notes:

When option [2] is configured, you can define the minimum
number of overlap digits to collect before sending the first SIP
message for routing the call, using the
MinOverlapDigitsForRouting parameter.

When option [2] is configured, even if SIP 4xx responses are
received during this ISDN overlap receiving, the device does not
release the call.

The MaxDigits parameter can be used to limit the length of the
collected number for ISDN overlap dialing (if Sending Complete
is not received).

If a digit map pattern is defined (using the DigitMapping or
DialPlanIndex parameters), the device collects digits until a
916
Mediant 1000B Gateway & SBC
Description
Document #: LTRT-27034