Audio unclear

[arunvoip]

All,

We are having the following problem in one of our installations:
The clients are able to login fine , they get calls and all that. They are not able to hear the customers clearly nor are the customers able to hear them well.

We have tested the following (all benchmarked against a similar setup in another location):
1. Changed the VoIP providers (same result) - we have used the same provider in another location with no issues!
2. loadavg - less than 1
3. Digium card is configured properly - no issues there
4. Bandwidth to provider sufficient - (it's a 1Mbps dedicated pipe) - Good RTTs / traceroute to VoIP provider normal
5. screen -r gives
22198.ASTVDauto (Detached)
23303.ASTupdate (Detached)
22194.ASTsend (Detached)
2018.asterisk (Detached)
22189.ASTlisten (Detached)
22202.ASTVDremote (Detached)

Setup details:
-- Asterisk - 1.2.10
-- VICIDIAL - 1.1.12
-- dial level of 1.2
-- number of agents =5
-- 2 Servers - one for MySQL and other for VICI/Asterisk both on FC5 (P4 Xeon 3GHz 1GB RAM with 80GB SATA - each) : they are not the best around but that's what we have
-- IAX softphones (idefisk) on Windows XP on clients
-- IAX trunk (on gsm) to provider

iax2 show netstats gives

-------- LOCAL --------------------- -------- REMOTE --------------------
Channel RTT Jit Del Lost % Drop OOO Kpkts Jit Del Lost % Drop OOO Kpkts
IAX2/2025-4 11 -1 0 -1 -1 0 -1 5 18 92 4 0 1 0 5
IAX2/2002-15 6 -1 0 -1 -1 0 -1 7 17 74 3 0 0 0 6
2 active IAX channels

We are stumped!

thanks
arun

[Op3r]

Have you check your network?

also check your headsets

[enjay]

Yea check the headsets and softphones.

Make sure the sound card you are using is decent quality as many onboard soundcards just dont cut it (ran into this problem myself ended up buying 50 Soundblaster Audigy's, this resolved my problem).

When you say unclear do you mean static? Echo? or just plain not loud enough?

Try playing with the gain settings in /etc/asterisk/zapata.conf bring them up to like 5.0 for txgain and rxgain see if that helps.

-enjay

[kchung]

Try recording some calls and listening to them w/ various machines/headphones. If they sound fine, it may be a network issue.

[arunvoip]

Thanks a bunch - Op3r, enjay and kchung.

We have a bunch of eight Public IPs and in the earlier setup had the two servers on two of those with the agents behind a NAT on the third. We ran some tests using the tools on http://www.myvoipspeed.com/ (using the eval version) and found that the network was not able (for some reason) handle this setup well (though it works great in another location!)

We have now moved the servers on a private IP (behind just one of those eight IPs) and it looks like it has addressed the problem fairly ok.

thanks again for your inputs!

[devafree]

For low audio, I tried adding the |s in the Meetme lines. When a conference is then entered , pressing * on the phone enters the menu, 4 and 6 to- or + the audio vuolume. Pressed 8 to save and quit the *. It works well enough for us, tho I was trying it first by DTMF (lol) , thinking the phone will not work if the agent is in Vicidial login, If the agent logout we repeated the procedure as and when the agent again re-logsin as there is no other way to save the volume level, or if there is please let me know.
Thanks
devafree

[enjay]

Can you just adjust the volume level with rxgain and txgain in zapata.conf?

[arunvoip]

but I'm using IAX trunk. I feel zapata works only with zap channel. If am I wrong please correct me.

thanks

[enjay]

Naw you are correct...