RE: RTP delay

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Sorry for being so vague...

The ambient is:

HighPATH3k <-ISDN-> Vanguard <-> GnuGK <-> Vanguard <-ISDN-> Definity

All connections are direct one, without NAT or Firewalls. When I call from
one extension in either side, the problem occurs.

Thanks for the VAD tip... I'm scheduling a test to see the effects. As
Vanguard didn't react well to Fast Start, they are disabled and I have to
search for Progress Indication configs.

Any way, thanks for the return and I'll report the results to the list.

Edson.

> -----Original Message-----
> From: openh323gk-users-admin@xxxxxxxxxxxxxxxxxxxxx [mailto:openh323gk-
> users-admin@xxxxxxxxxxxxxxxxxxxxx] On Behalf Of Stewart Nelson
> Sent: segunda-feira, 17 de abril de 2006 23:09
> To: openh323gk-users@xxxxxxxxxxxxxxxxxxxxx
> Subject: RE:  RTP delay
> 
> Hi Edson,
> 
> Your description is too vague.  Are there any IP phones, softphones, or
> ATAs in the system?  From what kind of device is the call originated?
> On what kind of device is it answered?  Is there any NAT involved?
> Is gnugk acting as proxy?  Is it only the called party that can't
> hear for several seconds (the caller can hear ok)?
> 
> The most common cause of long RTP delay is a combination of ProxyForNAT
> and silence suppression.  Try turning off silence suppression, at least
> on the originating device or gateway.  If there is an option to send
> RTP during Progress, try turning that on.
> 
> If possible, use Fast Start.  Also, set up your gateways to send Progress
> rather than Alerting.  If still no luck, report what Ethereal shows.
> (When does each end start sending / receiving RTP, relative to Progress
> or Connect?)
> 
> I know nothing about Vanguard.  Google for VG6540 or VG-6540 found nothing
> useful.  Please send a link to the product description.
> 
> --Stewart
> 
> ________________________________________
> From: Edson [mailto:4lists@xxxxxxxxx]
> Sent: Monday, April 17, 2006 4:42 PM
> To: openh323gk-users@xxxxxxxxxxxxxxxxxxxxx
> Subject:  RTP delay
> 
> We are facing a really anoing delay problem...
> 
> All H.323 signalization is ok, but when the called party peeks-up he
> experiment a silence for 4~6 seconds. We use ISDN E1 lines connected to
> Cisco (AS5300) and Vanguard (VG6540) gateways.
> 
> How is this delay explained? I already looked on the packets with
> ethereal,
> but couldn't find the reason. Is there any work-around/configuration on
> GnuGK to bypass this problem? Any help?
> 
> Edson.
> 
> 
> 
> 
> 
> 
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