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This feature does not support outgoing SUBSCRIBE message and will not generate an outgoing NOTIFY message with content type application/simple message-summary.
Maximum Number of TCAP dialogs is limited to 32768.
IMG will accept incoming NOTIFY request outside of a subscription as long as Event is message-summary and Content-Type is application/simple-message-summary.
IMG will return a 484 "Subscription does not exist" for any NOTIFY requests with Event and Content Types being something other displayed above.
Request for TCAP Service sent from NOTIFY shall contain user information from R-URI and FROM: URI in UPDF format.
Notify shall send a 200 OK or 4xx/5xx response based on response sent from SS7 side.
Feature 1580 MWI will not support outgoing SUBSCRIBE.
IMG Software version 10.5.2 supports ANSI only for this feature. In software version 10.5.3, support for the ITU protocol was added.
Gate Control Layer will create a unique dialog ID for the TCAP request. The ID will be 4 bytes long. First two bytes are used for a counter and last two are used to store NODE ID:
A timer is enabled after Gate Control Layer sends PPL Event Request to SS7. If no Event Indication is received after a timer expires the Gate Control Layer will send a clear to SIP. (4xx/5xx)
IMG will not generate an outgoing INVITE with TCAP request.
F-1580 Message Waiting Indicator is supported with SS7 redundancy.
If configuring a service such as CNAM or MWI on multiple IMG nodes, the SS7 Stack ID's cannot be configured with the same ID. For example, when configuring an IMG Node 0 with stack ID's 0 and 1 then any other IMG Nodes configured under any Logical Node can not have any of the stacks configured with the same ID's (0 or 1). By doing so, the TCAP services cannot be configured.
Related Topics:
IMG 1010 - Configuring Message Waiting Indicator - SIP to SS7