[cisco-voip] One way communication for IP phones

[Yunming Song]

actually it turns out that we turn off PIX firewall FIXUP protocol skinny 
2000,
it is weird, but fixed the problem.

----- Original Message ----- 
From: "Hering, Marc" <MHering at TheGaleCompany.com>
To: "Yunming Song" <yunming.song at digiconasp.com>; 
<cisco-voip at puck.nether.net>
Sent: Friday, October 29, 2004 2:10 PM
Subject: RE: [cisco-voip] One way communication for IP phones


> Sounds like 1 of two things,
>
> 1) your access lists are misconfigured on the PIX which would explain
> why it can run one way, but not the other (Higher level interface to
> lower level interface...)
>
> Also,
>
> I am going to assume there is a router between the sites somewhere...try
> adding the following command to the global config
> ip tcp path-mtu-discovery
>
> I had the same problem and that fixed it.,.,..
>
> -----Original Message-----
> From: cisco-voip-bounces at puck.nether.net
> [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Yunming Song
> Sent: Friday, October 29, 2004 3:14 PM
> To: cisco-voip at puck.nether.net
> Cc: Yunming Song
> Subject: [cisco-voip] One way communication for IP phones
>
> Hello Group,
>
> We have 2 sites, one in rockville and one in herndon.  All telephony
> servers and approx 100 IP phones are located in herndon behind a pix
> firewall.  Our rockville location also has several IP phones behind a
> pix firewall.
>
> In herndon, we are running CM 3.3(4)sr2, and Unity 4.0(4).
>
> In herndon, all IP phones can call each other as well as place outside
> calls and receive incoming calls.
> In rockville, IP phones can call IP phones in Herndon no problem.
> When IP Phones in Herndon call IP Phones in rockville, the rockville
> phone rings, but when the user in rockville picks up the receiver, the
> call terminates.  The same thing happens when rockville users try to
> call each other internally.
>
> Any idea is pretty much appreciated.
>
> thanks a lot,
> Yunming Song
> (571)323-5030
>
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