In reply to a post by WelshPaul:

In reply to a post by serichards:

In reply to a post by WelshPaul:

I use a Yealink W70B alongside two Yealink W56H handsets with A&A and Voipfone without issues.

Might flag it up to A & A then and see if they have any idea why it would suddenly do it.

When you say it works for a while and then the call quality is awful can you be more specific? Grab a SIP trace when the problem arises and it should help identify the cause.

For what it's worth, A&A only offer the PMCA CODEC. Do you have more than one CODEC enabled in the GUI and if so is PCMA at the top of the list? You should remove all CODECS from the enabled boxed leaving only PCMA enabled.
Account > CODEC > PCMA

I'll check the codecs first. A&A set it up and left 4 codecs on. PCMA was at the top. I've removed the other 3 now. Thanks.

Call quality basically is either buzzy and bassy sounding or if it's really bad it's choppy and cutting out like a bad microphone. It's done it once for 30 seconds at a time roughly once a week. But it was really bad this week it was minutes and if you just dialled out on a handset you could hear the ringing out was actually corrupted. Reboot the VOIP box and it's gone immediately. One time it did it before but it cleared after about a minute and went back to normal without having to do anything at all.

Hopefully just having the one codec will sort it. Most of the time it's absolutely fine and you wouldn't know you weren't on a landline.

Choppy and cutting out audio is usually the result of a poor internet connection or local network congestion (a network is overrun with more data packet traffic than it can cope with). Have you configured QOS to prioritise SIP traffic? Buzzy and bassy though? Base could be CODEC related but usually any buzzing sounds are caused by interference from something close by to the handset/base.

Could you sign up to another VoIP provider such as Voipfone and make a few test calls to compare call quality? Setting up an account won't cost you anything and Voipfone offer a free trial of their services which, comes with 15 free minutes of free calls to landline/mobiles.

Voipfone free trial

Making a few test calls using another VoIP provider would at the very minimum help identify if your Buzzy and bassy audio only happens with A&A or across the board.

In reply to a post by WelshPaul:

Choppy and cutting out audio is usually the result of a poor internet connection or local network congestion (a network is overrun with more data packet traffic than it can cope with). Have you configured QOS to prioritise SIP traffic? Buzzy and bassy though? Base could be CODEC related but usually any buzzing sounds are caused by interference from something close by to the handset/base.

Could you sign up to another VoIP provider such as Voipfone and make a few test calls to compare call quality? Setting up an account won't cost you anything and Voipfone offer a free trial of their services which, comes with 15 free minutes of free calls to landline/mobiles.

Voipfone free trial

Making a few test calls using another VoIP provider would at the very minimum help identify if your Buzzy and bassy audio only happens with A&A or across the board.

I can try that.

I did have vonage for a number of years and that was noticeably worse than A & A. That would often not ring the phone and would also be poor call quality a lot. The call quality on the Gigaset system has actually been the best. Don't think that misbehaved at all. It just failed to re-register instead.

Ironically I also had interference on the landline initially as it would hum. I think BT fixed that eventually. I also had choppy audio on a DECT phone even when it was a few feet from the base as well so I do wonder if there's some person with a death ray that sometimes points it at the house

Vonage servers are located in the US. Ideally you always want a server as close to you as possible for best results.

In reply to a post by serichards:

In reply to a post by serichards:

Yealink system has been in a couple of weeks and so far it's done none of the bad things the Gigaset one did. Line stays registered. Broadband can go away and come back and router can be rebooted and it seems to cope just fine.

Hopefully it will carry on like this for months on end.

Spoke too soon. Call quality awful suddenly. Had to reboot it to get it back to normal. So that's 3 weeks it will do of light use before it's got a problem.

Actually, I'm also experiencing call quality issues on my Yealink DECT phones...

When making or receiving calls the handset volume becomes distorted but only sometimes. When capturing a SIP trace of the problem, there is no distortion on the recording so the problem is hardware/firmware related. FYI - The other person informs me that the call quality is fine their end!

I'm seeing this problem when making or receiving calls on Andrews & Arnold and Voipfone. When performing an echo test with my Voipfone account, there is no distortion, but the volume db level at Voipfone's end is low. The distortion seems to happen when the inbound audio is relatively high.

I should point out that I have access to many Yealink W70B's, W56H's etc. All brand new stock and I am able to reproduce it on several handsets so far all running 61.85.0.55. I have downgraded my handsets to 61.85.0.35 and so far the issue hasn't reappeared.

Interesting. I checked the handset firmware I've got and it's 116.85.0.35 on the 73H.

It is definitely better with just one Codec so far.

I can hear the call quality degrade a bit sometimes. Will be interesting to see if a bit turns into constant or not.

I have the ear piece volume quite low to counteract Dear Dad and his speakerphone use which I think could be part of my excess incoming volume issue.

It's like the gain on the callers mic is too high and the speaker on the W56H starts to distort. Like turning up the volume to max on a Hi-Fi with cheap speakers connected.

I found that I could reproduce it every time on multiple W56H handsets when calling 0800 731 0297 with 61.85.0.55. I had the handset volume set to max at the time. This is the telephone number for DWP and it has rather loud audio playback.

Anyway, I have just flashed my W56H's with 61.85.0.45 and I will flash down to 61.85.0.35 (and so on) should it happen again. If that doesn't help, I will downgrade the W70B to 146.85.0.25 (currently running 146.85.0.40). If it still happens, I will swap out the W70B.

Edit: I have obtained following firmware for the W70B 146.85.0.43 and 146.85.0.48.

Edited by WelshPaul (Mon 20-Nov-23 18:48:22)

I've added the Stun server settings in as well. That's another improvement.

Since adding STUN server and removing the excess CODECS it's been a lot better. Drop outs are tiny and limited to a second or two and not had any of the long ones.

I haven't had any distortion or buzzing since downgrading my handsets from firmware version .55 to .35.