In this modern world of voice over IP and data signals we recently had a need to source some information on different Rinback signals used on analogue trunks. Ringback is the the actual bursts of ringing we hear when we call somebody. Each country has a different variation of timings used – in our particular problem we were having compatibility problems with some equipment designed for the German market being used in the UK.
The german ringback tone is 1 Second on and 4 Seconds off – in the UK it is 0.4 Seconds on 0.2 seconds off 0.4 Seconds on and 2.0 Seconds off – the compatibility issue was the UK equipment did not expect a maximum of a 4 second gap.
We always like to come back and do some good old telephony work 
We see Apple have announced that they are now supporting third party applications for the iPhone including WiFi based VoIP. As mentioned in a previous blog Truphone have already released a demonstration model late last year, they have confirmed their interest here and indicated they would be developing a fully fledged application.
Not only have Apple opened the iPhone up to external developers but they have also announced a $100 million developer fund from its VC partners called KPCB’s iFund™. There is now an SDK available for developers that allows applications to be tested on a regular iMAC before they are used on the iPhone. You can see it here
We are looking forward to see what external developers produce espescially in the VoIP area and many observers are waiting to see what happens with Skype and what applications they will surely produce.
Category GSM/3G, VoIP | 
Author admin | 
11 March, 2008 12:17 pm | 
Comments (0)
Tagged with: Apple, DECT, GSM/3G, iphone, IPT, PABX, SMS PBX, truphone, Voice over IP, voice over wifi, VoIP, WiFi