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Our testing of five videophone products - softphones from Nortel and Xten (on Macintosh and Windows platforms) and hard phones from InnoMedia and Leadtek - was not a pretty picture.
As with our other SIP testing, basic connectivity for voice calls between the videophones worked well. But we ran into substantial problems when we tried to use the video features.
Of the 25 cases we tested, only six of them gave acceptable video quality between phones, specifically only the single-vendor phone-to-phone calls. Going between vendor devices - despite having a completely switched 100M bit/sec network - was a recipe for complete failure, only one-way video, or just plain horrible video quality. For example, when connecting between the Xten and Leadtek videophones, we got a two-way video connection but the quality of the video at high speeds was so poor that we had to reduce bandwidth to 128K bit/sec or less to even see semi-continuous motion. Videophones turned into a Catch-22: Setting speed up to 512K bit/sec, high enough for acceptable video quality, locked up and crashed phones or kept them from making connections at all. Turning the speed down gave us better interoperability, but reduced the video to something akin to Neil Armstrong's 1969 moon walk.
A closer analysis of the SIP protocol messages flying between the phones showed that different vendors were picking very different parameters for their videostreams - and most of these parameters were not under the control of the end user
But lack of SIP interoperability does not preclude these phones from being fun gadgets to have on your desk. Here is a list:
Return to "Advanced SIP interoperability is slow in the making"
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