[Freeswitch-users] cannot make call, error INCOMPATIBLE_DESTINATION

[Michael Jerris]

It looks like we only have implementations set in multiples of 10ms.  You would have to modify code in switch_pcm.c in the loop where we add the implementations (around line 280).  

Mike

On Jun 6, 2013, at 10:52 AM, Steven Ayre <steveayre at gmail.com> wrote:

> Maybe. But the ptime will have a minimum value and possibly need to be multiples of a value. The allowable ptimes are codec-dependant. 5ms may well be too low to be allowable.
> 
> You can specify it using a @5i suffix in your codec preferences to override the default.
> 
> But I would NOT recommend 5ms.... It refers to how long a sample to put in a single RTP frame (packet). Lower values mean you lose less audio data if you drop a packet but also mean you're sending more packets. Every packet has IP + UDP + RTP headers, so has a certain amount of overhead. There's a sweet spot between efficient bandwidth use and not losing too much data if packets are lost. With a 5ms ptime you're going to have a massive amount of overhead which isn't justified - the packets might well contain more header data than audio data. If you're on a slow connection you might even find you start getting packet loss you don't otherwise get because of the extra bandwidth being consumed by the headers.
> 
> I would recommend changing the setting on the client instead to use 20ms.
> 
> -Steve
> 
> 
> 
> On 6 June 2013 12:57, Khue Nguyen Minh <khuenm at vega.com.vn> wrote:
> Can I config ptime of FS to 5?
> 
> 
> 2013/6/6 Steven Ayre <steveayre at gmail.com>
> Tell your SIP client to use a ptime of 20ms
> 
> 
> 
> On 6 June 2013 12:04, Khue Nguyen Minh <khuenm at vega.com.vn> wrote:
> Hi Antonio,
> 
> How I can fix it?
> 
> Khue.
> 
> 
> 2013/6/6 Antonio Teixeira <eagle.antonio at gmail.com>
> Hello.
> 
> There is a mismtach on the ptime
> http://wiki.freeswitch.org/wiki/Codecs
> 
> 
> 
> PCMU:0:8000:5:64000
> 
> PCMU:0:8000:20:64000
> 
> Antonio
> 

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