Can you connect an SIP phone with Twilio Endpoint? If so, how?

Question

I have an SIP phone system, based on the Linksys (Cisco) SPA942 telephones. I would like to take the existing PBX out of the equation and code a custom PBX for us using Twilio. I am familiar with Twilio and have coded many apps in the past, but the SIP functionality of Twilio is new to me.

Anyways, I have setup a domain, the ACL, and User credentials. and I have edited the phones configuration to connect to the twilio endpoint. However, the device never registers with Twilio. It sits idle attempting to register but it never has any success.

I know its not the firewall as its on an unfirewalled network connection so my suspicions are that either A) I have some settings wrong; or B) Twilio isnt geared to allow direct connection of a SIP phone directly to the system (requiring it to go through a tertiary system such as Asterisk or a Linksys PBX.

Can anyone tell me what Im doing wrong here?

Thanks, Rick

If you need the SIP registration support, you might want to check out the Plivo API as an alternative. You can register a SIP endpoint at Plivo—where I work—which directly connects with your SIP phone for both receiving and sending. Here's a blogpost written by one of our users who set up home SIP phone system using Cisco SPA301 and Plivo. If you want to quickly test this out for free, you can follow this tutorial. — dhfromkorea

Devin Rader Devin Rader · Accepted Answer · 2014-02-01T18:41:52

Twilio evangelist here.

[Update]

Twilio now supports SIP registration. Check out newer the answer from @Robert Welbourn below which links to docs that show you how to use it.

---- old answer ----

Unfortunately the answer today is B. We currently do not offer SIP registration so you cannot connect a SIP device directly to Twilio and receive inbound calls.

Hope that helps.

Can you connect an SIP phone with Twilio Endpoint? If so, how?

4 Answers