AudioCodes Mediant 800B User Manual page 866

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
does this regardless of whether or not the incoming SIP 200 OK
includes the Date header. If the SIP 200 OK includes the Date
header, the device ignores its value.
Notes:

This feature is applicable only to Tel-to-IP calls.

For IP-to-Tel calls, this parameter is not applicable. Only if the
incoming ISDN Connect message contains the Date / Time IE
does the device add the Date header to the sent SIP 200 OK
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.
866
Mediant 800B Gateway and E-SBC
Description
Document #: LTRT-10278