VoIP App for Android

I am looking for a VoIP App for Android. The use case is quite simple. I want to experiment with a PBX with extensions only, no trunk. I realise that without scope for a vendor tie in, this may not be quite the simplest request. Ideally free of course. Any suggestions?

Linphone is free and fine for testing etc.

As a permanent solution, especially with a commercial service provider, I’d be leaning towards the Acrobits stable for their features, especially operating system integration like native push which is awesome.

Thanks. Now to try Linphone on my SIP trunk before I get into the PBX.

In reply to a post by Pheasant:

I’d be leaning towards the Acrobits stable for their features,

I've been using Acrobits Softphone for a couple of years now. Recommended.

Acrobits looks interesting too, as Pheasant says for a permanent solution. The PBX is a very background project at the moment.

Before I went to Acrobits, I think I had Zoiper and Sipdroid. They were OK.

For playing around with a local SIP server, you may be better using one of these rather than Acrobits, because with Acrobits their server needs to be able to register to the SIP server: that means your SIP server needs to have a public IP address and be reachable from outside.

Yup. Definitely not a good idea to expose your Asterisk (or similar box) to the open internet, especially whilst you’re tinkering or getting used to how it all works. Even once setup properly you’d want to make sure it was decently secure. Too many miscreants out there.

In reply to a post by candlerb:

Before I went to Acrobits, I think I had Zoiper and Sipdroid. They were OK.

For playing around with a local SIP server, you may be better using one of these rather than Acrobits, because with Acrobits their server needs to be able to register to the SIP server: that means your SIP server needs to have a public IP address and be reachable from outside.

Thanks for the suggestions.

A bit puzzled by the Acrobits comment. Would an Asterisk box not be a competent SIP server in its own right for a private telephone network, without a connection to any outside server?

You can completely isolate your Asterisk box, but then you can’t run it with Acrobits as it needs to register with your Asterisk box on a publicly available IP to function.

This is the nature of how Acrobits push tech works - it has a constant connection from whatever SIP box it is your connecting to (in this case your own) so that its own servers manage the push notification process with the app on your phone.

It’s not like your Joe Average SIP client - it’s more of a full service - you just don’t notice it.

In reply to a post by Pheasant:

This is the nature of how Acrobits push tech works - it has a constant connection from whatever SIP box it is your connecting to (in this case your own) so that its own servers manage the push notification process with the app on your phone.

You can disable this feature but it is the default.