Today I stumbled upon a thread referenced at del.icio.us, where one of the posters states that he has developed a Perl script to display Caller ID information on the TV screen, by accessing the SIP messages directly and using MythTV.
This suggests a general solution: connect the modem line from the PC to the SIP ATA, along with the standard phone; let a PC application “sniff” SIP signaling information that the ATA is receiving and transmitting to the service provider. For those who remember TAPI or TSAPI, I am just replacing PSTN with SIP. The level of commonality between the service providers in their use of SIP will determine how ubiquitous an application can be across the service providers. This brings us to the recent discussion on the lack of SIP API.
Posted by aswath at May 2, 2005 05:35 PM
Several commercial Set Top Boxes (with direct IP connectivity or with built in DOCSIS) implement a pseudo SIP client at the STB, the client registers to the same number as the SIP ATA, so the STB receives the callerID at the same time as the SIP ATA, but the STB never answers the call.
No need to "sniff" SIP data or connect the STB directly to the ATA.
I guess you could do the same on MythTV
Posted by: Jorge Ortiz at May 4, 2005 09:38 AM