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Looks like all three are the same for you unless you add more cards.<br />
<br />
Usually BGM allows you to play the audio source through the phones, like news/weather. MoH is for when you place callers on hold, and SoT is usually a small sound clip for when you transfer.<br />
<br />
<a href="http://www.voicesonic.com/panasonic/manuals/KX-TDA100-200_System/KX-TDA100-200_2-0_Installation_Manual.pdf" rel="ugc">http://www.voicesonic.com/panasonic/manuals/KX-TDA100-200_System/KX-TDA100-200_2-0_Installation_Manual.pdf</a><br />
<br />
<a href="http://service.us.panasonic.com/OPERMANPDF/KXTDA100.pdf" rel="ugc">http://service.us.panasonic.com/OPERMANPDF/KXTDA100.pdf</a><br />
<br />
<a href="http://www.csportal.panasonic-la.com/DESCARGASPLA/PLA/CENTRALES/DIGITALES/12%20LINEAS/KX-TDA30BX/MANUAL%20DE%20USUARIO/Installation_Manual.pdf" rel="ugc">http://www.csportal.panasonic-la.com/DESCARGASPLA/PLA/CENTRALES/DIGITALES/12%20LINEAS/KX-TDA30BX/MANUAL%20DE%20USUARIO/Installation_Manual.pdf</a>
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Looks like all three are the same for you unless you add more cards.

Usually BGM allows you to play the audio source through the phones, like news/weather. MoH is for when you place callers on hold, and SoT is usually a small sound clip for when you transfer.

http://www.voicesonic.com/panasonic/manuals/KX-TDA100-200_System/KX-TDA100-200_2-0_Installation_Manual.pdf [http://www.voicesonic.com/panasonic/manuals/KX-TDA100-200_System/KX-TDA100-200_2-0_Installation_Manual.pdf]

http://service.us.panasonic.com/OPERMANPDF/KXTDA100.pdf [http://service.us.panasonic.com/OPERMANPDF/KXTDA100.pdf]

http://www.csportal.panasonic-la.com/DESCARGASPLA/PLA/CENTRALES/DIGITALES/12%20LINEAS/KX-TDA30BX/MANUAL%20DE%20USUARIO/Installation_Manual.pdf [http://www.csportal.panasonic-la.com/DESCARGASPLA/PLA/CENTRALES/DIGITALES/12%20LINEAS/KX-TDA30BX/MANUAL%20DE%20USUARIO/Installation_Manual.pdf]

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How i can run different music/message for both MoH and MoT?
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How i can run different music/message for both MoH and MoT?

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its ok but not 100% working answer. thanks
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its ok but not 100% working answer. thanks

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What is difference between BGM, MoH and Sound on Transfer. <br />
How I can run all there different voices for these three options.
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What is difference between BGM, MoH and Sound on Transfer. 
How I can run all there different voices for these three options.

BGM, MoH and Sound on Transfer

IP telephony (Internet Protocol telephony) is a general term for the technologies that use the Internet Protocol's packet-switched connections to exchange voice, fax, and other forms of information that have traditionally been carried over the dedicated circuit-switched connections of the public switched telephone network (PSTN). Using the Internet, calls travel as packets of data on shared lines, avoiding the tolls of the PSTN. The challenge in IP telephony is to deliver the voice, fax, or video packets in a dependable flow to the user.

IP Telephony

Hardware includes cell phones and other digital living devices, tablets, computers, servers, peripherals and components, printers and scanners, gaming consoles, networking hardware such as routers, hubs, switches and modems, storage devices and security equipment such as firewalls and other appliances.

Hardware

Telecommunication occurs when the exchange of information between two or more entities (communication) includes the use of technology. Communication technology uses channels to transmit information (as electrical signals), either over a physical medium (such as signal cables), or in the form of electromagnetic waves. The word is often used in its plural form, telecommunications, because it involves many different technologies.