Call Flow

ISUP Call Flow

The following example illustrates the message flow from an ISUP call where both stacks are configured for remote ISUP. This call flow include the call establishment and release. Each step in the call flow is described following the two figures.

Call Flow Steps

The following steps break down the call flow. The OPCs of the stacks are as follows:

• Stack 0: OPC is 0-0-3

• Stack 1: OPC is 0-0-6

1. The host sends the Transfer Request (0x0A) for IAM to the Matrix Controller for Component MTP3 HMRT (0x002C).

H->X

00 44 00 44 00 28 04 00 01 08 01 01 00 2c 00 0a 01 03 00 2b 00 30 04 25 00 0c 00 00 00 03 00 00 00 06 05 00 02 00 04 26 00 1c 01 01 01 00 20 00 0a 00 02 09 07 03 10 05 88 26 53 00 0a 07 03 11 05 88 26 03 00 00

Refer to Transfer Request for IAM - Message Breakdown for an explanation of this message.

2. The MTP3 transmits an IAM on the SS7 link.

3. The MTP3 on Stack 0 receives an IAM and sends a Transfer Indication (0x14) for IAM from component HMDT (0x002B) to the host.

X->H

00 44 00 43 00 25 04 00 01 08 01 00 00 2b 00 14 01 03 00 2b 00 30 04 25 00 0c 00 00 00 03 00 00 00 06 05 00 02 00 04 26 00 1c 01 01 01 00 20 00 0a 00 02 09 07 03 10 05 88 26 53 00 0a 07 03 11 05 88 26 03 00 00

Refer to Transfer Indication for IAM for an explanation of this message.

4. The host sends a Transfer Request (0x0A) for ACM to the matrix for Component MTP3 HMRT (0x002C) on stack 0.

H->X

00 2e 00 44 00 29 04 00 01 08 01 00 00 2c 00 0a 01 03 00 2b 00 1a 04 25 00 0c 00 00 00 06 00 00 00 03 05 00 02 00 04 26 00 06 01 01 06 10 00 00

5. MTP3 transmits ACM on the SS7 link.

6. MTP3 on Stack 1 receives an ACM and sends a transfer indication (0x14) for ACM from component HMDT (0x002B) to the host.

X->H

00 2e 00 43 00 26 04 00 01 08 01 01 00 2b 00 14 01 03 00 2b 00 1a 04 25 00 0c 00 00 00 06 00 00 00 03 05 00 02 00 04 26 00 06 01 01 06 10 00 00

7. The host sends a Transfer Request (0x0A) for ANM to the Matrix for Component MTP3 HMRT (0x002C) on stack 0.

H-X

00 2c 00 44 00 2a 04 00 01 08 01 00 00 2c 00 0a 01 03 00 2b 00 18 04 25 00 0c 00 00 00 06 00 00 00 03 05 00 02 00 04 26 00 04 01 01 09 00

8. MTP3 transmits an ANM on the SS7 link.

9. MTP3 on Stack 1 receives an ANM and sends a Transfer Indication (0x14) for ANM from component HMDT (0x002B) to the host.

X-H

00 2c 00 43 00 27 04 00 01 08 01 01 00 2b 00 14 01 03 00 2b 00 18 04 25 00 0c 00 00 00 06 00 00 00 03 05 00 02 00 04 26 00 04 01 01 09 00

10. The call is established.