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Mediant 2000 SIP User’s Manual 8. Gateway Capabilities Description
Version 4.4 161 July 2005
2. Use the number manipulation table (exemplified below) to assign NPI/TON values according
to the number’s prefix:
NumberMapIP2TEL= nortelnetworks.com/TrunkGroup3,30,$$,$$,1,2
In the above example, all numbers starting with the ‘nortelnetworks.com/TrunkGroup3’
string, are modified; the first 30 characters in this prefix string (domain and trunk group
names) are erased, and the NPI/TON are set to 1/2 respectively.
Note: The $$ signs represent the empty parameters ‘Prefix to add’ and ‘Number of
digits to leave’.
8.13.1.4 Transfer
To differentiate transferred calls (using the REFER method) from incoming ISDN calls, add the
following parameter to the ini file: xferPrefix = $; the parameter adds the ‘$’ sign (or any other
string) as a prefix to the transferred called number. The added string can be later removed using
the number manipulation rule.
Note: When using the PRI2SIP gateway, the NumberMapTel2IP = *, 1 manipulation
rule is used. This manipulation rule also applies to transferred calls,
corrupting the number by removing its first digit. Therefore, use the xferPrefix
= $ parameter to prepend a single character to the transferred number so that
the manipulation table only removes the added character without altering the
original number.
8.13.1.5 Other Nortel Specific Parameters
If the parameter ‘EarlyAnswerTimeout’ > 0 and Q.931 CONNECT was not received from ISDN for
‘EarlyAnswerTimeout’, the Mediant 2000 responds with 200 OK.
Asserted-Identity header is ignored, if received by Mediant 2000 gateway in INVITE message and
if ‘ApplicationProfile = 4444’.
Mediant 2000 gateway doesn’t include the Called Number Remoty-Party-ID header in INVITE (for
ISDNIP calls) if ‘ApplicationProfile = 4444’.