D.3 Exceptions and clarifications to clause 3 of ITU‑T Recommendation Q.763 as modified by ETS 300 356‑1

09.123GPPApplication of ISDN User Part (ISUP) Version 2 for the Integrated Services Digital Network (ISDN) - Public Land Mobile Network (PLMN) signalling interfacePart 1: Protocol specificationTS

Table D.3: Exceptions and clarifications to clause 3 of ITU‑T Recommendation
Q.763 [22] as modified by ETS 300 356‑1 [1]

Q.763 [22]
clause

Title

Remarks

3.3

Access transport

The access transport parameter will be transported transparently. It is the responsibility of the end points to ensure compatibility.

3.5

Backward call indicators

Bit M: terminating PLMN subscribers should be considered as ISDN terminations (this is the preferred situation, but other coding may be agreed between the PLMN and ISDN operators).

3.8A

Call transfer number

Nature of address indicator

Values used: 000 0011, 000 0100 (i.e. national and international numbers allowed).

3.10

Calling party number

Nature of address indicator

Values used: 000 0011, 000 0100 (i.e. national and international numbers allowed).

3.12

Cause indicator

For the coding of the location field, the exchanges at the interface between the mobile and fixed ISDN networks need not to be considered as an international interface.

The appropriate support of cause 20 within the originating network (e.g. provision of an announcement) is a matter of the network provider.

(continued)

Table D.3 (concluded): Exceptions and clarifications to clause 3 of ITU‑T Recommendation
Q.763 [22] as modified by ETS 300 356‑1 [1]

Q.763 [22]
clause

Title

Remarks

3.16

Connected number

Nature of address indicator

Values used: 000 0011, 000 0100 (i.e. national and international numbers allowed).

3.23

Forward call indicators

Bit A: the ISDN-PLMN interface can be an interface within the national network, and then the national/international indicator should be passed on transparently on this interface. It is assumed that the national/international indicator has been set to:
1 = "call to be treated as an international call"
for incoming international calls in an international gateway exchange in the fixed or mobile network, and that otherwise it is coded:
0 = "call to be treated as a national call".

Bit I: originating PLMN subscribers should be considered as ISDN terminations (this is the preferred situation, but other codings may be agreed between the PLMN and ISDN operators).

3.26

Generic number

Nature of address indicator

Values used: 000 0011, 000 0100 (i.e. national and international numbers allowed).

3.39

Original called number

Nature of address indicator

Values used: 000 0011, 000 0100 (i.e. national and international numbers allowed).

3.44

Redirecting number

Nature of address indicator

Values used: 000 0011, 000 0100 (i.e. national and international numbers allowed).

3.45

Redirection information

The redirection counter is incremented when the call is forwarded, however the mechanism for the allocation of a Mobile Station Roaming Number (MSRN) shall not be considered as an instance of call forwarding.

3.46

Redirection number

Nature of address indicator

Values used: 000 0011, 000 0100 (i.e. national and international numbers allowed).

3.54

Transmission medium requirement

The following value of the Transmission medium requirement parameter can be used in case multi-rate access is available in the mobile network:

0000 0111 2 ´ 64 kbit/s unrestricted

0000 1000 384 kbit/s unrestricted

0000 1001 1 536 kbit/s unrestricted

0000 1010 1 920 kbit/s unrestricted

Annex E (informative): Examples of echo control procedures