- Nortel IP Phone Mobile Communication Integration Guide

Dialing plans and telephone numbers 17

Dialing plans and telephone numbers

MC 3100 supports telephone numbers in the following formats

• Dial strings, where the user enters all the digits to be dialed. Examples

of dial strings include 2356, 63432356, 93432356 and 3432356.

• E.164 Fully Qualified International Numbers, where telephone

numbers start with the plus (+) symbol. E.164 Fully Qualified

International Numbers are also known as "plus numbers". Examples

of Fully Qualified International Numbers include +16131234567 and

+31123456789.

The dial plan available from MC 3100 should be the same as the dial plan

for a desk telephone. That is, if the user has a desk telephone and an

MCC 3100 device, the dial plan should be the same.

MC 3100 users should use the E.164 Fully Qualified International Numbers

for all stored Public Switched Telephone Network (PSTN) numbers in

address books and mobile device applications. By using this format, the

numbers can be dialed from any region or country, within the wireless

network or from the communication server.

The E.164 Fully Qualified International Numbers ensure that users do not

need to be concerned about dial prefixes or long distance codes. The

network determines how to place the call, based on the user’s location and

network connection.

When the user dials an E.164 Fully Qualified International Number, the

communication server puts the number in the request Uniform Resource

Indicator (URI) of the SIP INVITE message in the following format

sip: +CCCXXXXXXXX@domain; user=phone.

When using the ECS, configure the CNTC, NATC, and INTC parameters

in LD 15 to support E.164 Fully Qualified International Numbers. These

parameters ensure that fully qualified numbers within the same country

are dialed as national numbers, and international numbers are prefixed

correctly.

Example 1 (Switzerland)

ECS is Nortel Communication Server 1000 (CS 1000)

AC1=0, CNTC=41, NATC=0, INTC=00

Call to a number within Switzerland

A user initiates a call to a contact with the phone number +41123456789.

The URI incoming for the SIP INVITE for the call is

sip:+41123456789@domain.com;user=phone

CS 1000 digit processing strips the CNTC and adds <AC1 + NATC> to

Nortel Mobile Communication 3100

Mobile Communication 3100 and Communication Server 1000 Solution Integration Guide

NN49000-315 02.01 2 October 2009