Thanks! I was sceptical that FD_SETSIZE has anything to do with it
(that controls the maximum number of files that can be polled by
select() - but we don't poll media sockets, just write to them). But
now I see there's some code in sipp.cpp which sets the maximum number
of open files (i.e. the rlimit) to FD_SETSIZE, which affects even
sockets we're not polling - and -skip_rlimit skips that code, which is
why it works for you now. I think that's just the wrong thing to do,
and will probably remove that code entirely.

Best,
Rob

On 29 January 2014 16:04, Vijay Goje <vg...@ctigroup.com> wrote:
> -skip_rlimit flag fixed my issue and able to run more than 508 concurrent 
> calls with rtp.
>
> Regards,
> Vijay.
>
> -----Original Message-----
> From: Vijay Goje
> Sent: Tuesday, January 28, 2014 6:11 PM
> To: 'Rob Day'
> Cc: sipp-users@lists.sourceforge.net
> Subject: RE: rtp for only 508 concurrent calls
>
> Sorry forgot to mention that I am seeing rtp for only 508 'concurrent' calls 
> Tried with -trace_err and -trace_calldebug flags but didn't see any log 
> entries.
> When I am doing a capture I see rtp for only concurrent 508 calls and rest of 
> the concurrent calls don't have rtp.
>
> Regards,
> Vijay.
>
> -----Original Message-----
> From: robertk...@gmail.com [mailto:robertk...@gmail.com] On Behalf Of Rob Day
> Sent: Tuesday, January 28, 2014 5:54 PM
> To: Vijay Goje
> Cc: sipp-users@lists.sourceforge.net
> Subject: Re: rtp for only 508 calls
>
> I'm not aware of any built-in limit. If you run with "-trace_err" and 
> "-trace_calldebug", do those logs have any more information on what happens 
> after 508 calls?
>
> Best,
> Rob
>
> On 28 January 2014 22:46, Vijay Goje <vg...@ctigroup.com> wrote:
>> Hi Rob,
>>
>>
>>
>> I am using SIPp v3.4-beta2 with rtp stream.
>>
>> When I am running calls more than 508 say 600 calls I am seeing rtp
>> for only
>> 508 calls and not seeing rtp for the rest of the calls.
>>
>>
>>
>> I did set the ulimit to more than 1024 as shown below
>>
>> Ulimit -n 99999
>>
>> But when running the sipp I see the following
>>
>>
>>
>> Warning: open file limit > FD_SETSIZE; limiting max. # of open files
>> to FD_SETSIZE = 1024
>>
>>
>>
>> Is there any limit in sipp that's causing the rtp limited to 508 calls?
>>
>>
>>
>> Regards,
>>
>> Vijay.

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