LMSD SIP Call Progress Tone Interworking

The Oracle® Enterprise Session Border Controller supports Legacy Mobile Station Domain interworking tht allows SIP interworking with User Agents that support the 3GPP2 LMSD. The LMSD provides support for existing Mobile Stations in a network that supports IP bearers.

LMSD uses Alert-Info headers in a 180 Ringing response to an INVITE to indicate to a User Agent specific tones to generate locally by the UAC. Most User Agents that do not support LMSD will ignore the SDP in the Alert-Info and will not play ringback locally. The lmsd-interworking option allows for the system to suppress SDP in 180 Ringing, 486 Busy Here, and 503 Service Unavailable responses, so that the UAC plays local ringback.

LMSD Interworking Configuration

You can apply lmsd-interworking to the sip-interface facing the LMSD User Agents. For Example, if the endpoints uspporting LMSD are located in the core realm, then the lmsd-interworking option would be added to the core sip-interface.

To enable the LMSD Interworking option:

In Superuser mode, type configure terminal and press Enter.
```
ORACLE# configure terminal
ORACLE(configure)#
```

Type session-router and press Enter.

ORACLE(configure)# session-router
ORACLE(session-router)#

Type sip-interface and press Enter. If you are adding this feature to a pre-existing configuration, you will need to select and edit it.
```
ORACLE(session-router)# sip-interface
ORACLE(sip-interface)#
```
options—Set the options parameter by typing options, a Space, the option name lmsd-interworking with a plus sign in front of it, and then press Enter.
```
ORACLE(sip-interface)# options +lmsd-interworking
```
If you type the option without the plus sign, you will overwrite any previously configured options. In order to append the new options to the realm configuration’s options list, you must prepend the new option with a plus sign as shown in the previous example.
Save your work.