jcicc
04-08-2008, 08:41 AM
Hi Everyone,
This is a long post and I apologize, but I wanted to get all the facts in so I could cut right to my issues.
This is kind of a weird problem that happened to me recently. One day an external vendor in India was calling one of our sites in NJ. Both sites were Polycom VSX 7000s and were using ISDN. When the call connected, there was no video to either side, only audio. I noted that the two communicated at H.264. After numerous attempts, I had them call an FX that we had that communicated at H.263. The call went through with no issues. Since it was only a one-time thing, I didn't delve too deeply into it at the time.
But now a strange thing happened. I have an office in Santiago Chile that has a VSX 7000 and two Sony TL50s. They were trying to communicate to Sony TL50s in NJ and FL over our IP network. They had the same problem--they were only getting audio. I had all the machines calling each other locally and they worked fine, so I knew there was nothing wrong with any hardware. I tried the same trick that I did with India and had them dial H.263 as opposed to H.264 and the call went through.
Since the problem occurred between like systems (as well as Polycom to Sony), I can assume that hardware compatibility is not the issue. Since the issue occured over ISDN and IP, I wouldn't think that the transport is the issue, although I should point out that our Chile office uses AT&T MPLS to communicate through our network, and India was connecting to NJ on ISDN via an AT&T PRI.
So here's my questions:
Has anyone ever run across this? Is there something in H.264 that would prevent these systems connecting in their own native video protocol but work fine in H.263? (Remember that domestically these systems communicated at H.264 with no problems--it only seems to be an issue internationally.) More importantly, is there some way to correct this, or at least force the Sonys and Polycoms to roll back to H.263 on their own?
This is a long post and I apologize, but I wanted to get all the facts in so I could cut right to my issues.
This is kind of a weird problem that happened to me recently. One day an external vendor in India was calling one of our sites in NJ. Both sites were Polycom VSX 7000s and were using ISDN. When the call connected, there was no video to either side, only audio. I noted that the two communicated at H.264. After numerous attempts, I had them call an FX that we had that communicated at H.263. The call went through with no issues. Since it was only a one-time thing, I didn't delve too deeply into it at the time.
But now a strange thing happened. I have an office in Santiago Chile that has a VSX 7000 and two Sony TL50s. They were trying to communicate to Sony TL50s in NJ and FL over our IP network. They had the same problem--they were only getting audio. I had all the machines calling each other locally and they worked fine, so I knew there was nothing wrong with any hardware. I tried the same trick that I did with India and had them dial H.263 as opposed to H.264 and the call went through.
Since the problem occurred between like systems (as well as Polycom to Sony), I can assume that hardware compatibility is not the issue. Since the issue occured over ISDN and IP, I wouldn't think that the transport is the issue, although I should point out that our Chile office uses AT&T MPLS to communicate through our network, and India was connecting to NJ on ISDN via an AT&T PRI.
So here's my questions:
Has anyone ever run across this? Is there something in H.264 that would prevent these systems connecting in their own native video protocol but work fine in H.263? (Remember that domestically these systems communicated at H.264 with no problems--it only seems to be an issue internationally.) More importantly, is there some way to correct this, or at least force the Sonys and Polycoms to roll back to H.263 on their own?