Configuring an SS7 Trunk (Voice Data and Signaling Data Sent Through Different Channels)
Depending on whether voice data and signaling data are sent through different channels, the unified gateway can be connected to the peer device through two different Signaling System No.7 (SS7) trunk configurations. This topic describes how to configure an SS7 trunk in the scenario where voice data and signaling data are sent through different channels to the peer device. U1910 does not support the transmission of voice data and signaling data through different channels.
Prerequisites
1. For the U1911/U1960/U1981, an MTU board has been configured. For the U1980, a DTU board has been configured. For details, see Configuring Boards.
2. You have installed the digital trunk cable that connects the local office and the peer office. For details on how to install the digital trunk cable, see the Quick Installation Guide.
3. The Transmission mode parameter of the unified gateway has been set to E1.
Context
The SS7 trunk takes the SS7 signaling as the intra-office signaling. Both the ISDN User Part (ISUP) protocol and the Telephone User Part (TUP) protocol in the SS7 signaling system can be used to control inter-office trunk circuits. Therefore, the SS7 trunk can be classified into the ISUP trunk and TUP trunk. At the physical layer, the E1 trunk cable is used to connect to the peer device. At the signaling layer, the type of trunk to be used for connecting to the peer device needs to be negotiated with the peer device. Figure 1 shows the typical network.
Signaling data sent by the unified gateway must pass through a signaling transfer point (STP). The STP transfers signaling data to the PSTN switch. Voice data sent by the unified gateway is directly transferred to the PSTN switch through the E1 trunk. That is, voice data and signaling data are sent through different channels.
NOTE:
The STP supports the signaling transfer function. The function is used to transfer signaling messages to another signaling point.
The clock source is configured on one device so that the peer device can synchronize its clock with this device. The configuration of a clock source prevents the frame slip (voice packet loss).
If the unified gateway connects to multiple devices through E1 or T1 trunks, configure the clock source on any of these devices. The unified gateway will synchronize the time with this device. If the unified gateway provides the clock source, you do not need to configure a clock source.
Scenario Description
Configurations vary depending on the actual data plan. The following assumes that you need to:
1. Add a digital trunk circuit from the local office to the STP.
2. Set the attribute of the digital trunk circuit on port 0 in slot 2 of the U1960. Set the office route number to 1, signaling type to ISUP and start circuit identification code (CIC) to 0.
3. Add an MTP link on port 0 of the MTU board in slot 2 of the U1960.
4. Add a digital trunk circuit from the local office to the destination signaling point.
5. Set the attribute of the digital trunk circuit on port 1 in slot 2 of the U1960. Set the office route number to 2, signaling type to ISUP, and start CIC to 0.
Procedure
1. Log in to the web management system. For details, see Logging In to the Web Management System.
2. Choose from the navigation tree.
3. Click Add A Local Signaling Point in the SS7 trunk configuration area.
4. Add a local signaling point code (SPC).
5. Click Office0.
5. Set the parameters according to the parameter description on the page.
NOTE:
Obtain the Structure and Code values from a carrier.
6. Click OK.
7. Add an STP code.
8. Click Add A Destination Signaling Point in the SS7 trunk configuration area.
9. Click point0.
10. Set the parameters according to the parameter description on the page.
11. Click OK.
12. Add a DSP code.
13. Click Add A Destination Signaling Point in the SS7 trunk configuration area.
14. Click point1.
15. Set the parameters according to the parameter description on the page.
16. Click OK.
17. Add a digital trunk circuit between the local office and the STP.
18. Click the solid line between Office0 and point0.
19. Set the parameters according to actual situations and the parameter description on the page.
NOTE:
A maximum of two MTP links can be configured for the unified gateway, and each E1 port can be configured with only one MTP link. An E1 port that is not configured with any MTP links can share the MTP link with other E1 ports.
Table 1 describes the key parameters displayed on the page. For detailed description about the parameters, see the Web Management System Online Help.
Parameter | Description |
|---|---|
Signaling Type | The options are as follows:
The default value is ISUP. |
Start CIC | Circuit identification code (CIC), which is used to connect offices. The CICs configured on the trunk circuit that connects the local office and the peer office must be the same so that the two offices can be connected successfully. The value is an integer ranging from 0 to 4095. The default value is0. |
CRC | CRC is a data verification mechanism. The values of the local office and peer office must be the same. If the peer office enables the CRC, set this parameter to Yes. |
Link Timeslot | Circuit ID of a link, which specifies the timeslot in the E1 link of an SS7 trunk. The value is an integer ranging from 0 to 31. The default value is 16 |
NOTE:
Only the CLI is available if you want to bind different timeslots to different office routes. The command is as follows:
1. U1911/U1960/U1980/U1981: config modify board slot slot type <mtu | dtu | dtu8> tkcinboard tkcinboard officeno officeno
2. U1910/U1930: config modify cvp type dtu tkcincard tkcincard officeno officeno
Click OK.
Click the solid line between Office0 and point0.
Set the parameters according to actual situations and the parameter description on the page.
Click OK in the dialog box that is displayed.
Add a digital trunk circuit between the local office and the DSP.
Click the dashed line between Office0 and point1.
Set the parameters according to actual situations and the parameter description on the page.
NOTE:
Only the CLI is available if you want to bind different timeslots to different office routes. The command is as follows:
1. U1911/U1960/U1980/U1981: config modify board slot slot type <mtu | dtu | dtu8> tkcinboard tkcinboard officeno officeno
2. U1910/U1930: config modify cvp type dtu tkcincard tkcincard officeno officeno
Click OK.
Click the solid line between Office0 and point1.
Set the parameters according to actual situations and the parameter description on the page.
Click OK in the dialog box that is displayed.
The SS7 trunk configuration page is displayed.
If the line between the local office and the peer office turns green, the SS7 trunk configuration is complete.
Configure a clock source. For details, see Configuring a Clock Source.
Click Data Save in the upper right corner of the web management system.
NOTICE:
The unsaved configurations will be deleted after the device is restarted.
Verification
Task | Operation | Result |
|---|---|---|
Verify the trunk connection. | An intra-office user calls an outer-office user. | The call is successful. |
