[Asterisk-Users] 2 minutes pause before ring on H323 channel

[John Daragon]

John Daragon wrote:
> Peter Valkov wrote:
> 
>> I have build asterisk from latest CVS HEAD-05/09/05 with H323 support 
>> as described in README file.
>> Open H.323 version v1.17.1 and PWLib v1.9.0 on Mandrake Linux 10.2 
>> kernel-2.6.11
>>
>> I tested it with following phones: -- XLite (SIP softphone)
>> -- QMix SIP IP phone (PA168F)
>> -- SJPhone (H323 softphone)
>> -- QMix H323 IP phone (PA168F)
>> -- FireFly (IAX2 softphone)
>>
>> Everything works fine except a problem with h323 extension dialing. 
>> Behavior is the same for both
>> SJPhone (soft phone) and QMix (PA168F). When I dial such extension I 
>> have to wait 2 minutes
>> exactly (120 seconds) before extension rings. After long way of trial 
>> and errors with .conf files
>> I managed to minimize this time to 1 minute exactly (60 seconds)
>> exten => 20,1,Dial(H323/h323phone) ; this leads to 120 seconds pause 
>> before ring exten => 21,1,Dial(H323/h323phone at 192.168.0.101) ; this 
>> leads to 60 seconds pause before ring 
> 
> 
> Peter, hi;
> 
> I haven't looked at the openh323 code, and I might not get time to... 
> but in my limited experience, 60 second delays are almost always DNS 
> timeouts.

Yep - down in openh323/src/transports.cxx there's a method 
H323TransportAddress::GetIpAndPorts() which is called (eventually) by 
MakeCallLocked().  This in turn calls GetPortByService() and 
GetHostByAddress().

My guess is that the 60 second wait is caused by a request to a DNS 
server that is never honoured.

Of course, I've been wrong before...

jd

-- 

John Daragon                                          john at argv.co.ok
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