IN and Wireless Call Flows

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The following call flows provide examples of an application handling prepaid Intelligent Network (IN) services and voice controlled dialing using WIN and CAMEL. The following acronyms are used in the calls flows:

Table 1-4 Call Flow Acronyms

Acronym	Description
BCSM	Basic Call State Model
CCF	Call Control Function Function that sets up and tears down connections
HLR	Home Location Register
MSC	Mobile Switching Center
SCF	Service Control Function The service control point (SCP)
SN	Service Node
SRF	Specialized Resource Function Interactive Voice Response system, to play announcement (for example, Intelligent Peripheral)
SSF	Service Switching Function The switch (typically a Class5 or MSC for example)
UMSC	U(niversal Mobile Telecommunications System) Mobile Switching Center
VLR	Visitor Location Register

Voice Controlled Dialing with WIN

1. MS subscriber register to HLR and VLR and arm triggers.

2. Call comes in, ORREQ message is sent to SN.

3. SN ask MSC to connect resource to temporary local directory number (TLDN).

4. Call is setup to SN, prompt and collect user information.

5. SN send back ORREQ message with called party number (DGSTDIAL).

6. Call is setup to final destination.

Voice Controlled Dialing with CAMEL

1. TDP-R trigger must be armed on the switch

2. Call comes in, IntialDP is sent to SCF.

3. SCF ask SSF to connect call to the SRF.

4. PromptAndCollectUserInfo is sent to the SRF.

5. SRF plays an announcement and performs speech recognition.

6. SRF return the results (DigitsResponse) to the previous invoke method (PromptAndCollectUserInfo).

7. SCF send a CONNECT message to the SSF.

8. Call is setup to final destination.