Multiple connected VoIP phones (or ATAs) one number

If you connect two (or more) VOIP phones or ATAs all set up with same Log In details to the same router or switch, what happens? Do they all ring and you can answer any phone?

Cheers!

In reply to a post by Ancient_Mariner:

If you connect two (or more) VOIP phones or ATAs all set up with same Log In details to the same router or switch, what happens? Do they all ring and you can answer any phone?

Depends on the VoIP provider. Some let you log in ("register") multiple handsets to one phone number, others do not. If you have multiple registered they can be on different internet connections, in differnet parts of the world, and they all ring when the number is called.

What jchamier said.

If your use case is having multiple handsets in your home connected to a single SIP account then a lot of the DECT VoIP phones separate handsets and SIP accounts - so you can have multiple handsets on a single account but it's not firing multiple registrations at a server.

If you want to have multiple handsets in an office environment then you'd be better off with some sort of PBX (cloud hosted or otherwise).

I've not tested it myself but I would not have much confidence in multiple SIP registrations behind the same NAT being reliable.

In reply to a post by Ancient_Mariner:

If you connect two (or more) VOIP phones or ATAs all set up with same Log In details to the same router or switch, what happens? Do they all ring and you can answer any phone?

Cheers!

If there are several handsets/end-point devices behind your router registering to the same SIP host in the cloud, then the best practise advice advice is to not use the same SIP port numbers on each end user device, but to increment by one so that they are different. e.g. see advice below from Sipgate

https://teamhelp.sipgate.co.uk/hc/en-gb/articles/204...

This is subtly but fundamentally different to having one device (e.g. an asterisk box - a software PBX basically) behind your router handling multiple SIP registrations to the outside world and then having multiple handsets that connect to it, rather than a SIP provider directly to multiple handsets. If that makes sense.

I think Voipfone just calls the last device to register. Sipgate certainly allow more than one device to register and will ring both. I have only done this from different public IP addresses.