Port blocking without ACL's?

Unanswered Question
Jan 24th, 2008

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?

I have this problem too.
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alaskaopen Thu, 01/24/2008 - 16:49

Same VLAN, we can use telnet and ping. The only thing that does not work is port 1720.

neilobrien Fri, 01/25/2008 - 04:27

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,



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