VoIP conference with multiple incoming SIP calls

Question

I want to set up a VoIP system to allow people to remotely listen to given speeches in place.

We have a VoIP line which can receives up to 8 incoming calls. The soft will accept them with or without confirmation (we can work with a white list for example).

I tried Ekiga, but it seems not to manage multiple incoming calls. Linephone seems to be good, I succeeded to set a conference call between three SIP lines but I had to do it manually. Twinkle and Yate didn't work well (Linux Mint 17.x). I also saw pjsua, a command line soft, but not yet tested. So I need now some hints from the Internet.

PS: Allowing listeners to put their word in, for example by typing "*", would be a plus.

Answer 1

well there are two ways that comes in my mind:

the first is sicking with SIP (which is fine)... so i would try Jitsi:

• it is free (as in beer and speech)
• capable of conference calls
• isn't available via the default repositories but they provide pre-compiled packages and maintain their own repository

^{i have to add, that i don't like the GUI of Jitsi but the functions are pretty good!}

maybe also Ring is worth a try since it is the successor of SFLphone and it uses PJSIP, therefore it is SIP-capable, just don't create a Ring-account...

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the second way... for a "closed environment/user-base" Mumble is interesting:

• it is also free (as in beer and speech)
• Automatic Level Equalization
• Noise Suppression
• Priority Speakers
• clients for several platforms (also Android and iOS)
• it is often used by gamers with special features like in-app-Overlay or Positional-Audio, but they can be deactivated.

maybe create a separate room with password-protection on a public server or you can also host your own server (Murmur) to have full control.

Answer 2

Here's my feeling. I think we have the tools/bricks, but it's hard to find an out-of-the-box free software (or even free as free bier) solution.

The best way, in my humble opinion, is a to build a python-based apps with PJSUA module.

Answer 3

You can try with Twilio. They are a little bit expensive, but they are the liders on this kind of applications.