CH - Callback Handshaking

Layer	Management
Direction	To CallGem
Type of Service	CG
Interface ID	MA
Message Purpose	This message is sent by the control application to CallGem to request support for third-party advice of callback due.
Example	CH\TXABC001\ICMyTelephony
Explanation	The control application is requesting to be notified of callback requests for any outbound callback that will be launched through telephony interface 'MyTelephony'.
Notes
Introduced	V10.6.196

Parameters
Code	Name	Type	Mandatory?	Min Val	Max Val	Description
IC	IdentifyCTI	string	false	1	80	If present, indicates the telephony layer (switch). If not present, assumes handshaking for all telephony layers
TD	TenantDescriptor	string	false	1	80	If the tenant descriptor is passed any callback handshaking will be filtered by a specific tenant. If passed, the tenant descriptor _will_ be validated.
TK	Token	string	false	1	80	Token parameter
TV	TimeoutValue	int	false	1	3600	The number of seconds to wait before timing out requests for agents to handle outb ound callbacks.
TX	TransactionIdentifier	string	true	1	87	Used by subsequent messages from CallGem to identify the corresponding request. Must be unique across all requests.