Installation and Configuration Manual 4. Configuring the Enhanced Media Gateway
SBA for Microsoft Lync 95 December 2010
4.10.4 Number Normalization Examples
Two examples are provided below for number normalization. The examples are based on the
following assumptions: a PBX with prefix (local) number 333 and a 4-digit extension number that
begins with the digit 1 (i.e., 1xxx); National area code 206; Country code 1.
Modifying E.164 Numbers to PBX Format for Outbound Calls
Outbound calls refer to calls made by Lync 2010 users (OC clients) connected through IP to
the Lync 2010.
1. Local calls within the PBX: The caller dials only the last four digits (e.g., 1212). Lync
2010 translates (normalizes) the phone number into an E.164 number format:
+12063331212 (where +1 is the country code, 206 the local area code, and 333 the
PBX prefix number). The Media Gateway's Manipulation table is configured to send only
the last four digits to the PBX (i.e., 1212).
2. National calls to the same area code: The caller dials 9 for an external line, and then
dials a 7-digit telephone number (e.g., 9-555-4321). Lync 2010 translates (normalizes)
the phone number into an E.164 number format: +12065554321 (where +1 is the
country code, 206 the local area code, 5554321 the phone number). The Media
Gateway's Manipulation table is configured to remove (strip) the first five digits and add
9 as a prefix to the remaining number. Therefore, the Media Gateway sends the number
95554321 to the PBX, and then the PBX sends the number 5554321 to the PSTN.
3. National calls to a different area code: The caller dials 9 for an external line, the out-
of-area code, and then a 7-digit telephone number (e.g., 9-503-331-1425). Lync 2010
translates (normalizes) the phone number into an E.164 number format: +15033311425
(where +1 is the international code, 503 the out-of area code, 3311425 the phone
number). The Media Gateway's Manipulation table is configured to remove (strip) the
first two digits (i.e., +1), add then add 9 as a prefix to the remaining number. Therefore,
the Media Gateway sends the number 95033311425 to the PBX, and then the PBX
sends the number 5033311425 to the PSTN.
4. Making international calls: The caller dials 9 for an external line, the access code for
international calls (e.g., 011 for the US), the country code (e.g., +44 for the UK), the
area code (e.g., 1483), and then a 6-digit telephone number (e.g., 829827). Lync 2010
translates (normalizes) the phone number into an E.164 number format:
+441483829827 (where +44 is the country code, 1483 the area code, 829827 the
phone number). The Media Gateway's Manipulation table is configured to remove the
first digit (e.g., +), and add the external line digit (e.g., 9) and the access code for
international calls (e.g., 011 for the US) as the prefix. Therefore, the Media Gateway
sends the number 9011441483829827 to the PBX and the PBX, in turn, sends the
number 011441483829827 to the PSTN.
The configuration of the above scenarios is shown in the figure below:
Figure 4-35: Phone Number Manipulation Table for IPÆTel Calls
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