I manage a network whereby the branches are connected with VOIP using pots connected to local PABX. All has been well till yesterday when one branch cannot hear callers from the central site. I have tried checking all that i know of VOIP but in vain. Please, i need someone to point me in the right direction.
My background is routing and switching.
"What would make the remote users fail to hear me. I can hear them clearly"
In my experience the only time I had this happen is when the Voip phones had somehow gotten an IP that was on the data side of the network instead of in the voice vlan where it belonged. This caused the user to only get audio in one direction.
May be worth checking that nobody has messed about with your routing.
I assume that you have done this considering the R&S background but it is very easy to think its something to do with voice, thus overlooking the foundation that the voice requires to run over.
Definitely have route both ways for Voice VLANs? No new access lists blocking Voice subnet for the return leg etc etc....?
Previous post is a command output from both remote and cetral site:
I've treied to figure out what the issue could be in vain. Based at the HQ where the gw is located, i can hear the voice from the remote site, but they cannot hear me. If a call is orinated either from HQ or remote site, the results are the same. The voice gateway has only one ethernet interface and terminates other 31 sites which are working OK. The remote site has multiple interfaces and has been working till last saturday when it failed. Can't quite figure out whta could have changed at that time...if any.
From the output it looks like analog problems - either you're not getting audio or possible DSP problems.
You can start by reloading the gateways to see if this temporarily restores audio.
hth,
nick
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