�2���� Call Hold (HOLD)
������� 2.1���� Definition
������� 2.2���� Description
������� 2.3���� Operational requirements
������� 2.4���� Coding requirements
������� 2.5���� Signalling requirements
������� 2.6���� Interactions with other supplementary services
������� 2.7���� Interaction with other networks
������� 2.8���� Signalling flows
������� 2.9���� Parameter values (timers)
������ 2.10���� Dynamic description
�4����
Terminal Portability (TP)
������� 4.1���� Definition
������� 4.2���� Description
������� 4.3���� Operational requirements
������� 4.4���� Coding requirements
������� 4.5���� Signalling requirements
������� 4.6���� Interactions with other supplementary services
������� 4.7���� Interactions with other networks
������� 4.8���� Signalling flows
������� 4.9���� Parameter values (timers)
������ 4.10���� Dynamic description