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AudioCodes Enhanced Media Gateway 96 Document #: LTRT-18206
Modifying PBX, Local, and National Calls to E.164 Format for Inbound Calls
Inbound calls refer to calls received by OC clients connected through IP to the Lync 2010.
1. Local calls from the PBX or PSTN: the PBX user only dials a 4-digit extension number
of the OC client (e.g., 1220). The Media Gateway's Manipulation table is configured to
normalize the number into E.164 format and adds the prefix +1206333 to the extension
number. Therefore, the Media Gateway sends the number +12063331220 to Lync
2010, which relays the call to the OC client.
2. National calls with the same area code: the PSTN user dials a 7-digit phone number
(e.g., 333-1220), which is received by the Media Gateway. The Media Gateway's
Manipulation table is configured to normalize the number into E.164 format and adds
the prefix +1206 to the number. Therefore, the Media Gateway sends the number
+12063331220 to Lync 2010, which relays the call to the OC client.
3. National calls from a different area code: the PSTN user dials the national area code
and then a 7-digit phone number (e.g., 206-333-1220), which is received by the Media
Gateway. The Media Gateway's Manipulation table is configured to normalize the
number into E.164 format and adds the prefix +1 to the number. Therefore, the Media
Gateway sends the number +12063331220 to Lync 2010, which relays the call to the
OC client. Note: Whether the area code is received by the Media Gateway depends on
the country's PSTN numbering rules.
4. International calls: The PSTN international (overseas) caller dials the international
access and country code (e.g., 001 for the US), the national area code, and then a 7-
digit phone number (e.g., 206-333-1220), which is received by the Media Gateway. The
Media Gateway's Manipulation table is configured to normalize the number into E.164
format by removing the first two digits (e.g., 00) and adding the prefix plus sign (+).
Therefore, the Media Gateway sends the number +12063331220 to Lync 2010, which
relays the call to the OC client. Note: Whether the international and country codes are
received by the Media Gateway depends on the country's PSTN numbering rules.
The configuration of the above scenarios is shown in the figure below:
Figure 4-36: Phone Number Manipulation Table for TelÆIP Calls
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