S.R0125-552
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VoIP Supplementary Services Description:
4 Call Hold
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13 List of Tables ...................................................................................................................................................ii
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15 1 Call Hold (HOLD) ............................................................................................................................ 1
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1.1 Normal Procedures with Successful Outcome .................................................................... 1
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18 1.2 Exception Procedures or Unsuccessful Outcome ................................................................ 2
19 1.3 Alternative Procedures ........................................................................................................ 3
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1.4 Interactions with Other Wireless Services .......................................................................... 3
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522-i Contents
S.P0125-522-0 v0.2
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List of Tables 522-ii
1 Call Hold (HOLD)
Call Hold (HOLD) allows the controlling subscriber in an active call to temporarily
suspend media transmission and reception with the other party. The session is not torn
down, and can be later re-activated by resuming media transmission. Meanwhile, the
controlling subscriber can attend to a different task, such as responding to an incoming
call that is waiting, or initiating another call. More than one call may be placed on hold.
1.1 Normal Procedures with Successful Outcome
Authorization
HOLD may be generally available or may be provided after prearrangement with the
service provider.
Deauthorization
HOLD may be withdrawn at the subscriber’s request or for administrative reasons.
Registration
HOLD has no registration.
Deregistration
HOLD has no deregistration.
Activation
HOLD may be activated upon authorization.
Deactivation
HOLD shall be deactivated upon deauthorization.
Invocation
HOLD is invoked when a subscriber with HOLD active who is already engaged in a call,
elects to temporary suspend the present call.
Normal Operation with Successful Outcome
Hold:
- Initial State: Call is in active state, with media being transmitted;
- Controlling subscriber indicates its intention to put the call on hold; Note: User
interface for such an indication may be implemented in various ways, not subject to
this feature description;
- User agent in the active subscriber’s UE signals to the system and the other party’s
UA that the media transmission should be suspended.
- Media transmission is suspended, but the session is kept alive;
Resume:
- Initial State: Session is in suspended state, no media is transmitted in either
direction;
- Active subscriber indicates its intention to resume session;
- User agent in the active subscriber’s call signals to the system and the other party’s
UA to resume media transmission;
- Media transmission is resumed;
Accounting Record
The system should record accounting information for the following:
a. HOLD activation activities and events.
b. HOLD deactivation activities and events.
d. HOLD invocation activities.
e. HOLD usage duration.
1.2 Exception Procedures or Unsuccessful Outcome
Registration
None identified.
Deregistration
None identified.
Activation
If the subscriber is not authorized for the request, the system shall apply feature denial
treatment when activation is attempted.
Deactivation
None identified.
Invocation
If the controlling subscriber is not authorized, or if resources are not available, the system
shall give the calling party busy treatment.
1.3 Alternative Procedures
None identified.
1.4 Interactions with Other Wireless Services
Abbreviated Dialing
None identified.
Call Forwarding—Busy (CFB)
If a call arrives for a subscriber that has another call on hold, the called subscriber has
both HOLD and CFB active, the arriving call is forwarded (CFB is invoked).
Call Forwarding—Default (CFD)
None identified.
Call Forwarding—No Answer (CFNA)
None identified.
Call Forwarding—Unconditional (CFU)
None identified.
Call Hold (HOLD)
If HOLD is active, it should be possible to put more than one call on hold.
Call Transfer (CT)
If a call that had been placed on hold is subjected to CT, the call shall be put off hold
automatically (completion of transfer shall reactivate media transmission).
Call Waiting (CW)
None identified.
Calling Identification Presentation (CIP)
None identified.
Calling Identification Restriction (CIR)
None identified.
Customized Ring-Back Tone (CRBT)
None identified.
Directory Assistance
None identified.
Flexible Alerting (FA)
None identified.
Inbound Call Restrictions (ICR) / Anonymous Call Rejection (ACR)
None identified.
Message Waiting Indication (MWI)
None identified.
Outbound Call Restrictions (OCR)
None identified.
Short Code Dialing (SC)
None identified.
Terminating Identity Presentation (TIP)
None identified.
Terminating Identity Restriction (TIR)
None identified.
Three-Way Calling (3WC)
Not identified.
Vanity Numbers (VN)
None identified.
Voice Message Retrieval (VMR)
None identified.