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379 posts

Ultimate Geek
+1 received by user: 30


Topic # 119591 6-Jun-2013 23:29
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I've been using a Gigaset A580IP VoIP phone base station with two handsets, an A58H and a C610A, for a few years now. I'm set up with three providers, Faktortel, 2talk, and VFX. Both 2talk and VFX work flawlessly when selecting any codec except G.722. Faktortel is just there as a backup pre-paid service and I rarely use it.

The problem arises when I set G.722 as the codec for either 2talk or VFX. The sound quality is phenomonally good when I call the voicemail service of both providers, but when pressing DTMF tones, I get a sharp and brief electrical crackling sound (almost like accoustic feedback). This occurs most of the time on both handsets and using both providers. On odd occasions, the sound occurs without me pressing anything on the keypad. If I switch back to G.711, the problem goes away (and the voice quality is not nearly as good).

Has anyone come across this problem, and more importantly, found a solution?



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3594 posts

Uber Geek
+1 received by user: 79


  Reply # 831940 7-Jun-2013 06:19
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Hi David,
I would suggest if that you are experiencing this with both provider's that most likely its going to be a local device, firmware issue. I am assuming you are using DTMF via RFC2833 and not IN band ?

DTMF has to be pretty accurate using both the RFC and inband if it falls out of tolerance then your IVR's will not work, so hence the reason I would suggest its a local issue.

I would hazard an educated guess its firmware and the playback of the tones via a DSP type component is getting corrupted.

My first question is do you have the latest firmware ?

I love G722 btw, first choice of codecs within our network for all devices that support it.

Yes I am a employee of WxC (My Profile) ... but I do have my own opinions as well Wink


379 posts

Ultimate Geek
+1 received by user: 30


  Reply # 832019 7-Jun-2013 09:41
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Hi maverick,

DTMF is set to "auto". The same problem occurs when I set it to RFC 2833 or "SIP Info". That was the first thing I tried, but to no avail. The firmware has been updated once or twice over the last few years and it is the latest version. I vaguely recall G.722 working just fine a few years back before the firmware was updated. I figured it was a local issue, as would be extremely unlikely that both VFX and 2talk had the same issue at the same time.

(Forgot to mention that the main purpose of getting the A580IP was to make cheap calls to Australia via PennyTel. At 10 cents per call, it's a cheaper option than Faktortel, my backup provider. Sadly, they aren't taking any new customers on this cheap plan.)



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