There is a known bug as far as pcap replay and the port number of 5 
digit values are concerned.

https://sourceforge.net/tracker/?func=detail&atid=637564&aid=1954305&group_id=104305

I am not sure however, why you see failures some time for port value
less than 9999.

Hope this helps.
Regards,
Manish

bob gipper wrote:
> We're using SIPp to test an IVR app using Office Communcations Server 2007.  
> I'm using a scenario nearly identical to the uac_pcap.xml, except I'm passing 
> an out of band DTMF '1', waiting ~30seconds, then sending a '2'.  What I've 
> noticed is that the scenario SOMETIMES works and other times it does not.  
> The reason appears to be that the out of band DTMF tones aren't always being 
> received or recognized by the server-- the SIP connection is always made 
> fine, however.
>  
> In tracing the error logs, I noticed that when the server responds with an OK 
> (from an INVITE) on an audio port greater than 9999, (ie 33027), the scenario 
> would fail; near all other 4 digit ports would work.
>  
> In the OCS server, we initially had audio settings between 1024-65535; 
> changing this to 1024-9999 substantially increased my scenario success rate.  
> However, I do get the occasional failed scenarios on a few misc ports, like 
> 9056 or 5824-- to reiterate, these ports are what the server is responding 
> back in the OK response from the initial Invite; not the audio port 
> instatiated in the Invite.
>  
> I've disabled Windows Firewall, and this is still happening-- so I'm guessing 
> this is more of configuration issue on the receiving server itself?  Any 
> suggestions?  Thanks!
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