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The Legacy Mobile Station Domain (LMSD) or 3GPP2 defines the Session Initiation Protocol (SIP) inter-working with CDMA network for IP based trunking between CDMA Mobile Switching Centers (MSC) to enable Transcoder Free Operations (TrFO). When SBC is not configured with tone profiles, inter-working of calls are accomplished by additional configurations. For more information on LMSD interworking, see refer to _Key Features.

Configuring on EMA

To configure LMSD interworking without tones on the EMA:

1. Log on to the EMS SWe GUI. The following screen appears:

   Caption
   0 Figure 1 EMS GUI Home Page

2. On the navigation pane, select Element Management > SBX Manager.

3. Select the registered SBC manager to configure.

4. Select All > Address Context > Zone > SIP Trunk Group >Signaling.
   The Signaling page appears:

   Caption
   0 Figure 1 Signaling

5. Enable Stop Lmsd Tone On Update.
6. Click Save.

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To configure LMSD interworking without tones on the PSX Manager:

1. Log on to the EMS SWe GUI. The following screen appears:

   Caption
   0 Figure 1 EMS GUI Home Page

2. On the navigation pane, select Element Management > PSX Manager. 

3. Select the registered Master PSX.
   The PSX Manager screen appears.

4. Select the IP Signaling Profile from the Entity drop-down menu.
   The IP Signaling Profiles are listed.

5. Select the Default_LMSD profile.

   Info
   On bottom-left corner of the screen, click New to create a new profile and enter a name for IP Signaling Profile.

   Caption
   0 Figure 1 IP Signaling Profile

6. Select Accept Alert Info checkbox check box.
7. Click Save.