Weird, intermittent problem:
Some of the SP350 users sometimes, randomly, experience 1-way audio. When this happens, they have to put the person on hold and retrieve the call right away, and audio works (or just do it again 2-3 more times and it will work). Audio also kicks in when the user conferences in another staff. I have no idea how to even approach the problem as it's so random and can't discover any pattern to the problem. But here is some more data:
The SP350 phones are on a different subnet then what's the SV8500 is. Our IT dept swears that while most of the traffic is blocked between those subnets by the firewall in between, they opened the ports that are being used by the SP350. Since these users are making and receiving outside calls, not station-to-station calls, I can't verify whether the problem occurs on internal calls or not. But on outside calls, the SP350 obviously needs to talk to a) the SV8500 for signaling, b) the IP PAD card for audio, and c) a PRI Media Gateway that's yet on another subnet for audio for certain outgoing calls (depending on LCR settings).
I've actually observed this even when they are checking the voicemail, which is an internal call via the IP PAD card. You dial the number and you don't even hear the ringback tone, much less the voicemail prompts after it picks up.
This is all the data I can think of right now. When I un-program any of the stations and re-program it, the problem is still there. Putting the station on the different LEN doesn't solve it. Rebooting the computer that hosts the SP350 doesn't solve it. I've created location ID-s for the different subnets (SP350, SV8500/IP PAD, PRI MGC) and defined specific codec settings between those, but whatever I try, doesn't solve the problem.
Any idea?
Some of the SP350 users sometimes, randomly, experience 1-way audio. When this happens, they have to put the person on hold and retrieve the call right away, and audio works (or just do it again 2-3 more times and it will work). Audio also kicks in when the user conferences in another staff. I have no idea how to even approach the problem as it's so random and can't discover any pattern to the problem. But here is some more data:
The SP350 phones are on a different subnet then what's the SV8500 is. Our IT dept swears that while most of the traffic is blocked between those subnets by the firewall in between, they opened the ports that are being used by the SP350. Since these users are making and receiving outside calls, not station-to-station calls, I can't verify whether the problem occurs on internal calls or not. But on outside calls, the SP350 obviously needs to talk to a) the SV8500 for signaling, b) the IP PAD card for audio, and c) a PRI Media Gateway that's yet on another subnet for audio for certain outgoing calls (depending on LCR settings).
I've actually observed this even when they are checking the voicemail, which is an internal call via the IP PAD card. You dial the number and you don't even hear the ringback tone, much less the voicemail prompts after it picks up.
This is all the data I can think of right now. When I un-program any of the stations and re-program it, the problem is still there. Putting the station on the different LEN doesn't solve it. Rebooting the computer that hosts the SP350 doesn't solve it. I've created location ID-s for the different subnets (SP350, SV8500/IP PAD, PRI MGC) and defined specific codec settings between those, but whatever I try, doesn't solve the problem.
Any idea?
