# Configuring Local Switching

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Descriptions

GSM subscriber numbers continue to grow around the world. Most of the new GSM subscribers are coming from low income populations of the under-developed countries and a lot of them are living in rural/remote areas without infrastructure and radio coverage. The most popular ways to connect the rural/remote areas to the core telecommunication network in the under-developed countries are microwave and satellite links. In quite a lot of areas, satellite is the only available solution. But the backhaul satellite link is expensive and the transmission bandwidth is a bottleneck. For operators, the transmission cost of the backhaul is a significant factor of the total operation expenses. The cost of the transmission is one of the largest barriers in bringing the mobile services to the under-developed countries.

Intelligent RTP Local Switching (iRLS) function is a solution for helping the operators achieves significant saving in the transmission bandwidth between the core network and the rural/remote areas to overcome the barrier.

In standard GSM architecture, calls are routing to the MSC even if the calling and the called parties are in the same BSC zone. iRLS function enable the GSM system to route calls locally whenever the calling and called parties are in the same BSS zone; hence saving the backhaul transmission bandwidth. iRLS only controls the routing of the call traffic, the call signaling is still under the control of the host MSC. iRLS is integrated in UltraWAVE MSS and works with iPALIM function.

Implementation

| Configure iPALIM Parameters

Refer to Configuring iPALIM to complete the iPALIM configuration.

| Configure MSC Parameters

Refer to Enabling Local Call and Routing by Location to complete the MSC Routing Zone configuration.

| Install and Configure VIM Software

1.FTP VIM software (rtp_proxyInstall_Rx.x.xx.tgz) to VIM server as www account.

//The default FTP directory is /home/www//

2.Telnet to the VIM server and switch to the super user:

login: www

Password:

[www@vim-1 www]$ su -

Password:

3.[root@vim-1 root]# mv /home/www/rtp_proxyInstall_Rx.x.xx.tgz /usr/local/src

4.[root@vim-1 root]# cd /usr/local/src

5.[root@vim-1 src]# tar xvfz rtp_proxyInstall_Rx.x.xx.tgz

6.[root@vim-1 src]# ./rtp_proxyInstall/install

//Run script to install VIM software as prompt//

7.[root@vim-1 src]# cd /usr/local/rtp_proxy/conf/

//The rtpproxy.conf is stored under this path//

8.[root@vim-1 conf]# vi rtpproxy.conf

RTPPROXYID=1234

//Specify the index number in the VIM domain name. e.g. the full VIM domain name is "VIM-1234".//

RTPPROXYIP=192.168.0.1

//Specify the IP address of the VIM server.//

RTPPROXYPEERIP=0.0.0.0

//It is an optional parameter for IP restriction, fill the IP of related MSS.//

//Reserved as 0.0.0.0 if no IP restriction required.//

SERIALNUM=00000250

//It is the SN displayed on EMS GUI.//

9.Save file and exit editor by type:

:wq

10.Start the VIM process by the following command:

[root@vim-1 conf]# rtpproxyd start

| Configure iRLS Parameters

1.Go to EMS >Configuration >NSS >iRLS.

2.Click the button at the upper right corner.

1.On the System tab, configure the relevant parameters given in the following table.

2.Click the button to update parameters to application servers.

Sub-parameter | Description (Click highlight SAVE after change) | Recommended Value
RLS Flag | Enable or disable the RTP Local Switching feature. | Enable

1.Click the VIM MG tab, and then click New at the bottom of the VIM MG table.

2.In the VIM MG ID box, select an available number for the new MG, and then click the button.

3.In the VIM MG Option window, configure the relevant parameters given in the following table.

4.Click the button to update parameters to application servers.

MG Parameters | Description | Recommended Value
Title | Specify an identifiable name to the VIM Media Gateway. | VIM MG-1
IP | IP address of this VIM server. | VIM IP
Domain Name | The domain name of the connected VIM. Format as: Key word “vim-“ followed by the RTPPROXYID which configured in the rtpproxy.conf. | vim-1234
Switching Mode | Select the switching mode of the specified Media Gateway. Select MGCP as default. | MGCP
Endpoint | Method of MGCP endpoint description. Select Unstructured as default. | Unstructured
Type | Type of MG endpoint. Read only. | VIM
Max Physical Ports | The total physical port number of the Media Gateway. Enter 2 as default. | 2
Max Channels | The total channel number of the virtual MG. Enter 64 as default. | 64
Packetization Period | The period over which encoded voice bits are collected for encapsulation in. Select x20ms as default. | x20ms
Codec Type | Specify the codec type of the Media Gateway. Read only. | AMR-12-2
Audit Timer | The time interval between sending AUEP message from MGC to MGW to check the trunk status. | 0

1.Click the Routing Zone tab.

2.In the Routing Zone List window, configure the relevant parameters given in the following table.

3.Click the button to update parameters to application servers.

Sub-parameter | Description (Click highlight SAVE after change) | Recommended Value
Site Type | Specify the type of relevant routing zones which configured in the MSC routing zone table. The traffic among "local" routing zones will be local switched. | Local

See Also

• Configure iPALIM

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