BT broadband drops iChat screen sharing when voice call initiated

Just a question, and a warning if anyone out there in the UK is contemplating BT (British Telecom) broadband, you might get this issue.
I can share a screen with someone on BT braodband, but using voice at the same time makes the video very slow and jumpy. So, my solution used to be to phone on a normal phone line and just use the iChat for screen sharing.
Now, my mother has switched to BT broadband + BT phone (was Metronet broadband + BT phone), now, every time I start a voice call at the same time as screen sharing it crashes the iChat app.
BT tell me it is porbably a fault with the applicaiton, and the fact that it worked for over 3 years whilst on Metronet is pure coincidence. The whole reson she switched to them was to try to save a little money, they want to charge £50/hr to diagnose what the issue might be.
Does anyone else have this problem? If so, has anyone discovered the cause?
Thanks
Stephen

HI,
Describe in more detail please what you mean by "Crash"
Can you Video Chat ?
Can You Audio Only chat ?
These both use the same ports when making a connection and during the actual Chat
A Screen Share is an Audio Chat+ and uses a random port for the Screen Sharing side.
As this port is random you cannot set up Port Forwarding or Port triggering (If the router part does that) and you need to use UPnP (Universal Plug and Play).
UPnP is normally On by default in the later Home Hubs (2 and 3)
Early versions
If she happens to be using iChat 3 or earlier though there can be issues as the Hub is capable of VoIP and using the phone over the Internet.
VoIP uses a protocol over the internet called SIP (Session Initiation Protocol)
This has internationally agreed ports of 5060-5063 (it uses one and will try one at time if not available)
Early version of iChat also used port 5060 to make connections.
However some ISPs started to Block these ports and then charge extra for this "extra" service (sometimes without notification)
Some Modems that can "route' the Phone over the internet also need to have setting changed to allow iChat to work, (Basically the device has a SIP filter regardless of the addresses on the data packages meaning they don't get to the computer and get "lost" as they are not addressed to the Phone either).
Later versions of iChat moved away from the 5060 port(s) and used 16402 as the first choice.
Skype that also uses SIP to make connection have never used the 5060 range.
If there is a error message about Unexpectedly Quit we could do with seeing the "Crash Log" from her Home Folder/Library/Logs/CrashReporter/iChat.
11:15 PM Friday; April 6, 2012
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
 iMac 2.5Ghz 5i 2011 (Lion 10.7.3)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
 Mac OS X (10.6.8),
"Limit the Logs to the Bits above Binary Images."  No, Seriously

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Message was edited by: Changren Yong
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9:12 PM Friday; August 12, 2011
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
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Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
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Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"

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The Documentation was lacking last time I looked.
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Hi,
Change the resolution on the Older OS.
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9:05 PM Wednesday; October 17, 2012
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
 iMac 2.5Ghz 5i 2011 (Mountain Lion 10.8.2)
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Fix for iChat Screen Sharing Problem I was Having

Okay, I just thought I'd chime in and try to help some people from going through the frustration that I recently went through with iChat in Leopard. Here's my story.
iChat screen sharing used to work for me and suddenly one day it stopped working correctly... lemme explain. I would let someone share my screen, and it would start working and they would wave their mouse around and 10 seconds later, it will freeze and lose connection with a timeout.
At first I thought it was a firewall issue but, after thinking about it.... I thought, how could it be if it was working for 10 seconds and suddenly stopped? If it was a firewall issue, it wouldn't work at all. Then I thought maybe my iChat app got corrupted, so I used Time Machine (yay!) to restore iChat from one of the first days I got Leopard. That didn't work. So then I figured my preferences got corrupt, so I deleted my com.apple.ichat.plist file and still didn't work. I was so mad that Apple made this feature basically useless for me until I had a crazy hunch.
After an hour if pulling out my hair, I finally had an idea of what might be causing the crash... I noticed I had my old iSight plugged in (the external firewire iSight) into my Apple Cinema Display. I unplugged it and iChat screen sharing worked PERFECTLY. You should also know that I don't have problems with my iSight, it works well on Video Chat and Audio Chat and even presentation mode but, it screwed up screen sharing.
In conclusion, if you're experiencing sudden connection losses with iChat screen sharing, check to see if you have an iSight plugged into your Mac and unplug it.
Also, you're welcome.

Thomson-Alcatel 780 modem.
Unfortunately this is going to needs a new modem (or Bridge this one and have a router)
Read this section http://www.ralphjohns.co.uk/page4a.html#_text
Although the SIP Binding to port 5060 in this device could be UnBound in Version 4 firmware it has not been fully Unbound in Version 5 or 6 (Despite the version 5/6 instructions further down that section).
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