Add multiple sip registrars to one phone

I'd like to integrate some phone status information into our crm system (calling, on the hook, busy etc). I would prefer not to build and maintain a fully functioning SIP server because i only need very basic information. Also, our VOIP provider already maintains a fully functioning SIP server, and they are way better at it. Basically, I would my crm sever to be kept up to date on anything the phone does? Would it be possible for our crm server to receive any SIP messages the phones send to our VOIP provider.

1. Can I tell a sip phone to do that?
2. Is such a feature supported by many phones?
3. Am i looking at this in the wrong way? I'm completely new to SIP and phone integration so there is a good chance there is an easier or better way to do this.

Thank you for your help!

You might use phone feature called Action URL. It is generating HTTP GET requests on events like on hook / off hook, these request can be used to pass events to CRM.