ASAI and Call Control
■Invalid Information Element contents (CS0/100)
The party_id value of the request is invalid. For example, a Third Party Selective Hold is sent for the destination of a ringing call (the call is ringing and not yet answered at that endpoint). The party_id specified in the party_id Information Element has not passed through the connected stage and is therefore invalid.
■User busy (CS0/17)
The user is busy with another ASAI request.
■Invalid call type (CS3/43)
The call cannot be held due to the type of call (for example, emergency,
Protocol Error (NAK) Cause
The ECS issues the following cause for generating a protocol processing error:
■Protocol error (CS0/111)
The Q.932 protocol has been violated or the capability invoked is not consistent with this association. For example, invoking the Third Party Make Call capability on a Domain Control association is inconsistent.
NOTE:
For more information regarding protocol errors and a complete list of reason codes (cause values), see the DEFINITY Enterprise Communications Server CallVisor ASAI Protocol Reference,
Considerations
The adjunct must know the party_id before placing the party on hold. A party may only be put on hold if it is in on the call.
After a party is placed on hold through a Third Party Hold request, the user does not receive dial tone (regardless of the type of phone [set]). Thus, subsequent calls must be placed by selecting an idle call appearance or through the Third Party Make Call Request.
Only station extensions support this capability; any requests containing party_ids corresponding to a trunk will be denied.
If the party is already on hold on the specified call when the ECS receives the request, a positive ACK is returned.
NOTE:
An analog set can be looked at as having two call appearances, CA1 and CA2.
