So why is it that Sorenson's nTouch Mobile doesn't support backward compatibility for H.263? There are different flavors of H.264, there are devices that don't have enough CPU to do H.264, and even Sorenson's new nTouch VP supports H.263. Sorenson has chosen not to support backward compatibility with H.263, so they do not work with ZVRS or with a number of other videophones (including their own VP100). Underneath, they both home back to the same Mirial Carrier Server (MCS).Īs for Purple: yes, the videophone client that Purple resells does indeed support H.264. The Sprint SV4 videophone client is identical to the ZVRS Z4 videophone client, save the branding which is different. Sorenson's nTouch Mobile is not working well with Sprint, as Sprint runs on the ZVRS platform, so I can dismiss your first assertion immediately. I try my best to not represent any given VRS provider, even one that I'm employed by, as the VRS industry as a whole deserves an unbiased and untarnished view of the engineering details. The Sorenson FAQ appears to be misrepresenting reality. Note that the RTP is also dynamic payload type 96 only (there is no payload type 34 for H.263 RFC2190 offered). The other 4 capabilities are receiveUserInputCapability hookflash, basicString, dtmf, and encryptedIA5String. ReceiveVideoCapability: genericVideoCapability (5): ITU-T Rec. logicalChannelSwitchingCapability: Falseġ. This is a factual statement given experimental data gathered from numerous call attempts today: There is no H.263 offered in the capability set.įrom the perspective of an H.323 sniff, the Sorenson FAQ is just flat out incorrect. Presently, when a Sorenson nTouch Mobile client on Android places a call, the Sorenson gateway 209.169.242.13 makes an H.323 H.225 Call Setup TCP port connection to 1720 and sends a SETUP message with the H.245 "fast start" capability set advertising only the genericVideoCapability (H.264). I started to answer your question last night, but decided it best to wait until I made it in to the office to do a proper sniff to give you accurate information.
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