AudioCodes Mediant 800B User Manual page 905

User's Manual
Parameter
[IgnoreISDNSubaddress]
[ISUBNumberOfDigits]
Version 6.8
these values are mapped to the outgoing ISDN Setup message.
If the incoming ISDN Setup message includes 'subaddress' values
for the Called Number and/or the Calling Number, these values are
mapped to the outgoing SIP INVITE message's 'isub' parameter in
accordance with RFC 4715.
Determines whether the device ignores the Subaddress from the
incoming ISDN Called and Calling numbers when sending to IP.

[0] = (Default) If an incoming ISDN Q.931 Setup message
contains a Called/Calling Number Subaddress, the Subaddress
is interworked to the SIP 'isub' parameter according to RFC.

[1] = The device removes the ISDN Subaddress and does not
include the 'isub' parameter in the Request-URI and does not
process INVITEs with this parameter.
Defines the number of digits (from the end) that the device takes
from the called number (received from the IP) for the isub number
(in the sent ISDN Setup message). This feature is only applicable
for IP-to-ISDN calls.
The valid value range is 0 to 36. The default is 0.
This feature operates as follows:
If an isub parameter is received in the Request-URI, for
1
example,
INVITE sip:9565645;isub=1234@host.domain:user=phone
SIP/2.0
then the isub value is sent in the ISDN Setup message as the
destination subaddress.
If the isub parameter is not received in the user part of the
2
Request-URI, the device searches for it in the URI parameters of
the To header, for example,
To: "Alex" <sip: 9565645@host.domain;isub=1234>
If present, the isub value is sent in the ISDN Setup message as
the destination subaddress.
If the isub parameter is not present in the Request-URI header
3
nor To header, the device does the following:

If the called number (that appears in the user part of the
Request-URI) starts with zero (0), for example,
INVITE sip:05694564@host.domain:user=phone SIP/2.0
then the device maps this called number to the destination
number of the ISDN Setup message, and the destination
subaddress in this ISDN Setup message remains empty.

If the called number (that appears in the user part of the
Request-URI) does not start with zero, for example,
INVITE sip:5694564@host.domain:user=phone SIP/2.0
then the device maps this called number to the destination
number of the ISDN Setup message, and the destination
subaddress in this ISDN Setup message then contains y
digits from the end of the called number. The y number of
digits can be configured using the ISUBNumberOfDigits
parameter. The default value of ISUBNumberOfDigits is 0,
thus, if this parameter is not configured, and 1) and 2)
scenarios (described above) have not provided an isub
value, the subaddress remains empty.
905
56. Configuration Parameters Reference
Description
Mediant 800B Gateway and E-SBC