Vorlage 3a

Technical requirements for the handover interfaces for the execution of telecommunications surveillance

c) The value to be entered into a spare half-octet is undefined in ETSI TS 133 108 V13.4.0.

It shall be set to the value of “0000”. At the receiving side spare shall be ignored, i.e. the message containing the Calling Party Subaddress shall not be rejected because a spare bit is set to “1”.

d) Depending on the presence of Mobile Bearer Service Code and Mobile Tele-service

Code in signaling messages, information shall be provided in octets 22 and 23 as

follows:

1. If both, Mobile Bearer Service Code and Mobile Teleservice Code are provided by signaling, octets 22 AND 23 shall be present.

2. If Mobile Bearer Service Code is provided by signaling, and Mobile Teleservice Code is NOT provided by signaling, octet 22 shall be present.

3. If Mobile Teleservice Code is provided by signaling, and Mobile Bearer Service Code is NOT provided by signaling, neither octet 22 nor octet 23 shall be present.

4. If neither Mobile Teleservice Code nor Mobile Bearer Service Code is provided by signaling, neither octet 22 nor octet 23 shall be present.