[cisco-voip] 7912 problem with Firewall Between them and Call Manager

[Ryan Ratliff]

There are no phone settings to control if/when data gets fragmented.   
There are some settings in CUCM that can cause the server to bundle  
messages going to phones but that would probably result in bigger  
packet sizes (and thus more fragmentation).  The setting is "Remote  
Device" on the phone page.

--- From the help for Remote Device ---
If you are experiencing delayed connect times over SCCP pipes to  
remote sites, check the Remote Device check box in the Phone  
Configuration window. Checking this check box tells Cisco Unified  
Communications Manager to allocate a buffer for the phone device when  
it registers and to bundle SCCP messages to the phone.

Tip : Because this feature consumes resources, be sure to check this  
check box only when you are experiencing signaling delays for phones  
that are running SCCP. Most users do not require this option.

Cisco Unified Communications Manager sends the bundled messages to  
the phone when the station buffer is full, as soon as it receives a  
media-related message, or when the Bundle Outbound SCCP Messages  
timer expires.

To specify a setting other than the default setting (100 msec) for  
the Bundle Outbound SCCP Messages timer, configure a new value in the  
Service Parameters Configuration window for the Cisco CallManager  
service. Although 100 msec specifies the recommended setting, you may  
enter 15 msec to 500 msec.

The phone must support SCCP version 9 to use this option. The  
following phones do not support SCCP message optimization: Cisco  
Unified IP Phone 7935/7936. This feature may require a phone reset  
after update. Refer to the Synchronizing a Phone topic.
-----------

In the end if your firewall is dropping packets it should be fixed.

-Ryan

On Jul 14, 2009, at 6:27 PM, Victor Rodriguez wrote:

Hi, all



I have a problem with ip phone 7912, when i make a phone call the  
ipphone ring once and then lose contact with the Callmanager and goes  
to CCM fallback, I have others models and works them properly, the  
cisco TAC told me that the firewall is dropping packets because those  
are fragmented they suggest to upgrade the version of my firewall,  
but is FWSM and I have several contest that could be affected.



I upgrade the firmware for the ip phone to the last and I have the  
same behavior, do you know how to change the phone parameters to  
avoid send fragmented packets?



Best Regards

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