Version 6.4 703 March 2012
SIP User's Manual A. Configuration Parameters Reference
Parameter Description
values are mapped to the outgoing SIP INVITE message's
‘isub’ parameter in accordance with RFC 4715.
[IgnoreISDNSubaddress]
Determines whether the device ignores the Subaddress from
the incoming ISDN Called and Calling numbers when sending
to IP.
[0] = 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
(default).
[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.
[ISUBNumberOfDigits]
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 value is 0.
This feature operates as follows:
1 If an isub parameter is received in the Request-URI, for
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.
2 If the isub parameter is not received in the user part of the
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.
3 If the isub parameter is not present in the Request-URI
header 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
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