7 Interworking classifications

09.073GPPGeneral Requirements on Interworking between the Public Land Mobile Network (PLMN) and the Intergrated Services Digital Network (ISDN) or Public Switched Telephone Network (PSTN)TS

7.1 Service interworking

Service interworking is required when the Teleservices at the calling and called terminals are different. No service interworking, except for facsimile group 3 (GSM Teleservice 61 or 62 interworking with standard facsimile group 3 service), has been identified as a requirement of the GSM system for PSTN/ISDN network based services.

7.2 Network interworking

Network interworking is required whenever a PLMN and a non‑PLMN together are involved to provide an end to end connection and may be required in instances of PLMN to PLMN connections.

The concept of Bearer Services was developed for the ISDN and has been extended to the PLMN. A bearer service is defined (in GSM 02.01) as:

A type of telecommunication service that provides the capability for the transmission of signals between user‑network interfaces.

Bearer services are described by a number of attributes, where an attribute is defined as a specified characteristic of an object or element whose values distinguish that object or element from others.

For the purpose of this TS, a PSTN is assumed to provide a bearer service which equates to an ISDN 3,1 kHz audio bearer service.

Refer to GSM 02.02 for complete list of bearer services. Refer to GSM 04.08 for coding of Bearer Capabilities.

Table 3: Bearer Service Interworking

Bearer service category in GSM PLMN

Bearer Service in GSM

Bearer service in ISDN

Service in PSTN

Circuit mode unstructured with unrestricted digital capability

Asynchronous Data 300 bit/s

Asynchronous Data 1.2 kbit/s

Transparent and
Non transparent

Asynchronous Data 1 200/75 bit/s

Not Applicable

Asynchronous Data 2.4 kbit/s

Cct mode structured 64 kbit/s unrestricted

Asynchronous Data 4.8 kbit/s

Asynchronous Data 9.6 kbit/s

Asynchronous Data general

Circuit mode unstructured with unrestricted digital capability Transparent

Synchronous Data 1.2 kbit/s

Synchronous Data 2.4 kbit/s

Synchronous Data 4.8 kbit/s

Synchronous Data 9.6 kbit/s

Synchronous Data general

Circuit mode unstructured with unrestricted digital capability.
Non‑transparent

Packet Services
see GSM 09.06

Packet Services
see GSM 09.06

3,1 kHz Audio Ex PLMN Transparent and Non‑transparent

Asynchronous Data 300 bit/s

Asynchronous Data 1.2 kbit/s

Cct Mode
3,1 kHz Audio

Asynchronous Data 1 200/75 bit/s

Cct Mode
3,1 kHz Audio

Asynchronous Data 2.4 kbit/s

Asynchronous Data 4.8 kbit/s

Asynchronous Data 9,6 kbit/s

Asynchronous Data general

3,1 kHz Audio Ex PLMN

Synchronous Data 1.2 kbit/s

Transparent

Synchronous Data 2.4 kbit/s

Synchronous Data 4.8 kbit/s

Synchronous Data 9.6 kbit/s

Synchronous Data general

(continued)

Table 3 (concluded): Bearer Service Interworking

Bearer service category in GSM PLMN

Bearer Service in GSM

Bearer service in ISDN

Service in PSTN

3,1 kHz Audio Ex PLMN
Non Transparent

See GSM 09.06

See GSM 09.06

Alternate speech /data circuit
mode unstructured with 3,1 kHz audio ex PLMN
Transparent

alternate speech/
asynchronous
(with user rates 300 to
28800 bit/s as above)

alternate speech/
synchronous
(with user rates 1200 to
28800 bit/s as above)

Alternate speech/data circuit
mode unstructured with 3,1 kHz
audio ex PLMN
non transparent

alternate speech/
asynchronous
(with user rates 300 to
28800 bit/s as above)

Cct mode
3,1 kHz Audio

Cct mode
3,1 kHz Audio

Circuit mode with speech followed
by data
Transparent and Non transparent

Cct mode speech followed by
data
300 to 28800 bit/s
asynchronous as above

Cct mode
3,1 kHz audio

Table 4: Network interworking of GSM Teleservices

Teleservice in
GSM PLMN

Lower layer capabilities
addressed in the GSM Bearer
Capabilities IE

Bearer service
in ISDN

Service
in PSTN

Telephony

Unstructured with speech capability

Speech or Cct mode

Cct Mode

Emergency calls

Unstructured with speech capability

3,1 kHz audio

3,1 kHz audio

Alternate speech/
facsimile group 3

Data Cct duplex synchronous access
alternate speech
group 3 fax

Cct mode 3,1 kHz
audio

Cct mode 3,1 kHz
audio

Automatic
Facsimile group 3

Data Cct duplex synchronous access
group 3 fax

Cct mode 3,1 kHz
audio

This table does not identify any relationship between Teleservices in the GSM PLMN with those in the ISDN/PSTN, it is merely to identify the interworking of the lower network layers of that teleservice with the network layers i.e. bearer service in the ISDN/PSTN.

7.3 Signalling interworking

See GSM 09.03.

7.4 Numbering

See GSM 03.03.

7.5 Supplementary service interworking

For general aspects of supplementary services refer to GSM 03.11, GSM 03.8x and 03.9x series.

Not every supplementary service may be used in combination with each basic service. The applicability of each supplementary service for a basic service is defined in GSM 02.8x and 02.9x‑series. Certain application rules are also set out in GSM 02.03, 09.05 and 09.06.

This subclause only deals with data service specific aspects of supplementary services, i.e. MSC/IWF functions concerned in combination with supplementary services. This interworking is described in GSM 02.04, GSM 02.8x, and 02.9x‑series, GSM 03.11, GSM 03.8x and GSM 03.9x‑series, if applicable.