Aswath Weblog

Call-in-one phone

Today SIPPhone announced that they have started to market an adapter that has both PSTN and IP interfaces can route a call to either of the network. This is in contrast to the joint announcement from Skype and Siemens regarding a similar device. It is a good development in that the industry is paying attention to the devices rather than service providers.

Unfortunately there are no further details on the capabilities of this device and I have so many questions:

1. Can the device register for multiple accounts? To multiple proxies?
2. Does it generate Caller ID on the FXS port?
3. If I am on a SIP call and a call comes on the PSTN interface, what happens? A call waiting tone on the FXS port? How about Caller ID?

Update: After exchanging a few emails (they are prompt and complete in answering your questions) the answers to my questions are:

1. The device can register to only one proxy
2. It does generate Caller ID
3. Call waiting works only on the same interface. So if you are on a PSTN call, the call on the IP interface will go unansered and so forwarded to voice mail.