We've had an issue since we went live nearly two years ago on Asterisk where people complain about not being able to talk while someone else is talking. I had assumed for a very long time this was because of the phones we went live with (Grandstream GXP-2000's) and for the longest time I believed this was a speakerphone problem only. Last week during budgets, a request to buy new phones was put in to fix this problem. It was then that I finally researched and found that our phones do in fact support full-duplex on the speakerphone and handset. So, I'm looking for where I may have missed, perhaps an option on the Dial() command? Something in the phone config? We use SIP for phone to phone conversations, IAX for site to site conversations and Zaptel for PSTN lines. I've been told it happens regardless of protocol, so I assume it's one of the above options. Thanks for any help, Ken -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.digium.com/pipermail/asterisk-users/attachments/20081117/d8622ef0/attachment.htm
On Mon, 17 Nov 2008, Ken Williams wrote:> We've had an issue since we went live nearly two years ago on Asterisk > where people complain about not being able to talk while someone else is > talking. I had assumed for a very long time this was because of the > phones we went live with (Grandstream GXP-2000's) and for the longest > time I believed this was a speakerphone problem only. > > Last week during budgets, a request to buy new phones was put in to fix > this problem. It was then that I finally researched and found that our > phones do in fact support full-duplex on the speakerphone and handset. > > So, I'm looking for where I may have missed, perhaps an option on the > Dial() command? Something in the phone config?I've used Grandstreams for a couple of years now. Generally gotten on OK with them, although there are people here who've been badly "bitten" by them.. One thing to check is the hardware revision and software revision - the later software is much better - I'm using Program-- 1.1.6.16 Bootloader-- 1.1.6.5, but new software isn't as reliable on old phones as it could be - in particular my very first GXP2000 with that software experiences the occasional glitch/speech lock-up for a few seconds every now and then during a call. The speaker-phones do work OK though. Actually one of the better ones I've tried! I've not put anything special in the phone config - dial flags I use are WTon> We use SIP for phone to phone conversations, IAX for site to site > conversations and Zaptel for PSTN lines. I've been told it happens > regardless of protocol, so I assume it's one of the above options.I use the same in various locations - everything working fine. Asterisk 1.2.30 if that makes any different for you... Have you tried to make a direct IP call from one Grandstream to another? Try that, and bypass asterisk altogether and see what happens... (best to be in different rooms though!) Gordon
Ken Williams wrote:> > We?ve had an issue since we went live nearly two years ago on Asterisk > where people complain about not being able to talk while someone else > is talking. I had assumed for a very long time this was because of the > phones we went live with (Grandstream GXP-2000?s) and for the longest > time I >Sound like your echo canceller is set to aggressive. Make it like a walky-talky. From the archives, January 2006: On Friday 20 January 2006 15:36, Ronald Hartmann wrote:> > Anyone know if it is possible to control how aggressively the > > "Aggressive" mode behaves. >No.> > I have a situation where Normal echo cancellation is not quite enough, > > however when I turn on aggressive mode > > We are attacking it to hard and I am unhappy with the walkie talkie > > behaviour of the Aggressive mode. >The agressive canceller is agressive because it is designed to turn your voice channel into a half-duplex (walkie-talkie) communications channel. You can't have a "half half duplex" situation. :-) Have you tried recent SVN trunk with the MG2 echo canceller? I have found that to be the absolute best to date. -A. Doug -- Ben Franklin quote: "Those who would give up Essential Liberty to purchase a little Temporary Safety, deserve neither Liberty nor Safety."