VoIP Supply Q&A: Ringtones and BLF with Grandstream and Elastix in a Law Firm, Grandstream HT502 ATA Disconnect Duration, and Moimstone MWP1100A

July 31, 2015 by Nathan Miloszewski

VoIP Supply Q and A

Our tech support team here at VoIP Supply offers great pre- and post-sale support plus provisioning, consultations, and configuration and installation help.

We get a lot of VoIP hardware and software questions and realized that these solutions should be shared with everyone.

Here now are our top three (real) questions and answers from this past week (from VoIP users just like you).

Elastix miniUCS and Grandstream GXP2130 different internal extensions and BLF

Q: I recently installed an Elastix miniUCS with Grandstream GXP2130 phones in a law firm and they requested a few features. They were hoping to have a different ring tone for internal extensions when calling as well as being able to “see” which line was in use on the phones?

A: You can customize the ringtone by creating rules for those internal extensions.

See Page 39, “Match Incoming Caller ID.” of the Grandstream GXP Series Admin Guide:

Download Grandstream GXP2130/GXP2140/GXP2160 Admin GuideAlso, you can enable the BLF function (busy lamp field) so you’ll be able to see what extensions are in use.

For example, this is what the different colored lights mean:

  • Green = Available
  • Red = In Use

You can enable the BLF function by configuring the “BLF Server’ field under General account settings of the GXP2130.

How to setup Grandstream HT502 ATA disconnect duration

Q: Hi, I recently purchased some Grandstream HT502 ATAs. The ATAs have a pretty standard configuration with my VoIP provider. So I have the analog lines going out of the ATAs and into my legacy on-site PBX system.

The problem I am having is if I call in on my cell phone and the call comes in on the ATA and rings my legacy PBX and the auto-attendant starts talking and then I hang up my cell, the call will “live on” in my PBX for several minutes.

It’s like the on-site legacy PBX is not getting the correct disconnect signal from the ATA….any tips?

A: By default the Grandstream HT502 ATA supports busy tone disconnect.

This is not supported by all legacy PBX’s.

You need to check and or test what kind of disconnect the PBX supports. It could be polarity reversal, that then needs to be enabled, or loop current disconnect.

For loop current, you need to increment the disconnect duration by 100 ms and try until you reach the proper value (~500 to ~1000). These settings are under FXS on the WebUI.


In short, test the other disconnect method the HT supports.

Updated Response From Customer:

Thanks, set disconnect to 1000 and now it is disconnecting calls properly.

Download Moimstone MWP1100A Admin Guide

Q: Where can I get the Admin Manual for MWP 1100A

A: No need to look any further, you can download the Moimstone MWP 1100A admin manual right here:

Download VoIP Systems Guide

That’s all for this week, stay tuned for next week’s VoIP Q & A.

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