Nortel Networks NN43001-321 User Manual

Page 34

Converged Desktop Services

Non-telephony-based SIP URIs

In accordance with the preceding Rule 4, non-telephony-based, or regular,
SIP URIs must not be passed between systems in a mixed CS 1000/MCS
5100 network.

There is one exception to this rule — regular SIP URIs can be passed
between systems in the Refer-to header.

ATTENTION

Rule 5: In a mixed CS 1000/MCS 5100 network, for routing purposes, regular
SIP URIs can be passed between the two systems only within a Refer-to header.

The refer operation is not initiated by CS 1000 SIP Gateways. It is used by
the MCS 5100 in the following scenarios:

•

Call redirection (for example, a call transfer) initiated by the MCS 5100
— The SIP URI in the Refer-to header is analyzed only by the MCS
5100 system and has no impact on the CS 1000 system.

•

Click-to-Call operation of a CD user — The SIP URI in the Refer-to
header is analyzed by the CS 1000 system and has to be understood
by the system. Therefore, the Username field of the SIP URI must be
in the form of a DN.

ATTENTION

Rule 6: In a mixed CS 1000/MCS 5100 network with Converged Desktop users,
the CS 1000 SIP Gateway must support regular SIP URIs within the Refer-to
header.

If the Username field of the SIP URI is not in the form of a DN, the CS
1000 SIP Gateway handles the refer operation according to normal SIP
processing. In other words, it lets the MCS system route the call to the
destination indicated in the Refer-to header.

If the Username field of the SIP URI is in the form of a DN, the CS 1000
SIP Gateway configures NPI = Private and TON = CDP (the default settings;
the latter having the same effect as TON = Unknown). The CS 1000 SIP
Gateway then passes the processing of the refer operation to the CS 1000
Call Server.

Converged Desktop implications

The biggest impact of the adopted addressing scheme on the Converged
Desktop feature in a mixed CS 1000/MCS 5100 network is on Click-to-Call.

With Click-to-Call, Converged Desktop users initiate a call using their
converged Multimedia PC Client user interface, but use their CS 1000 client
to conduct the voice conversation when in Converged Mode.

Nortel Communication Server 1000

Communication Server 1000 to MCS 5100 Converged Desktop Type 2 Configuration Guide

NN43001-321

01.05

Standard

Release 5.0

15 February 2008