01-24-2008 01:37 PM - edited 03-05-2019 08:41 PM
Hi, I am using a Cisco 3750 switch that connects to Avaya phones and an Avaya call server. The problem I am having is that port 1720 does not seem to be going through the switch. But I don't have any kind of access-list applied at all. Does anyone have any ideas as to why this is happening?
01-24-2008 03:41 PM
Is it a simple topology e.g. the server and phones on the same VLAN? Can the server ping the phones? Use the switch's telnet client (with /source-interface) to try to open the socket on the server.
01-24-2008 04:49 PM
Same VLAN, we can use telnet and ping. The only thing that does not work is port 1720.
01-25-2008 08:52 AM
Then it sounds to me like the issue is your server. Are you sure there's not some host firewall on the thing?
TCP/1720 is H323 for the poster that asked.
01-25-2008 04:27 AM
Hi - What is supposed to be listening on this port??
If everything is on the same VLAN then there shouldn't be a problem if what ever is listening on port 1720 is in fact set up correctly.
However, if the phones and call server are on a voice VLAN (which is usually the case) you may not be able to get to the other vlan at all.
Hope that helps,
Neil
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