Installation & Maintenance Manual 21. Configuring Normalization Rules for E.164 Format
Version 6.8 183 Microsoft Lync Server
21.1 Number Normalization Examples
Two examples are provided below for number normalization. The examples are based on
the following assumptions:
PBX with prefix (local) number 333
4-digit extension numbers that begin with the digit 1 (i.e., 1xxx)
National area code is 206
Country code is 1
21.1.1 Modifying E.164 Numbers to PBX / PSTN Format for Outbound
Calls
Outbound calls refer to calls made by Lync clients to a PBX / PSTN number. Each index
entry is described below:
1. Local Calls within PBX: The caller dials only the last four digits (e.g., 1212). Lync
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 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 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 Manipulation table is
configured to remove (strip) the first five digits and add 9 as a prefix to the remaining
number. Therefore, the PSTN 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
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 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
PSTN Gateway sends the number 95033311425 to the PBX, and then the PBX sends
the number 5033311425 to the PSTN.
4. Dialing 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
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 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 PSTN Gateway sends the number
9011441483829827 to the PBX and the PBX, in turn, sends the number
011441483829827 to the PSTN.
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