[cisco-voip] One way communication for IP phones

[Ryan Ratliff]

I believe that is an (older) bug in Pix code.   If you update your Pix 
to a newer version and the problem returns you may need to enable 
skinny fixup again.

-Ryan
On Nov 1, 2004, at 8:42 AM, Yunming Song wrote:

> 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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>>
>>
>>
>>
>>
>>
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>>
>
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