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TG800 On GSM side voice is disrupted on random calls

Krzysztof Pogłodziński

May 07, 2019 09:29

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While using TG800 on about 3-5% of calls we encounter problem with voice on one side.
Topology:
Computer <---[sip / udp voip]---> TG800 <---[gsm] ---> GSM Phone


We have recorded audio on both ends.
Below two calls, each with two recordings (one per VOIP side, one per GSM side):
call1 - voip_side: https://ufile.io/oyegrlxx
call1 - gsm_side: https://ufile.io/och2bqgu
call2 - voip_side: https://ufile.io/7lx6dg2n
call2 - gsm_side: https://ufile.io/bmahyvdj

Record on VOIP side sounds good. Recording is made by sniffing udp traffic between A and TG800, so this is exacly what goes into TG800. So our voip softphone works fine.
Record on GSM side is bad - voice of voip caller is hardly recognizable.

We had TG200 on tests before in the same spot and problem didn't occured. We also have some GSM phones in the same location with the same GSM provider and problem doesn't occur. So it's not a problem of signal strength etc. Espessialy that voip caller hears gsm caller fine.

Looks like TG800 sometimes is messing with sound conversion from VOIP to GSM. We have tried to change all settings - echo cancelation, volume, etc. nothing helps.

Anyone has encountered simmilar problem? Any ideas?

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12 comments

• 0
  
  Larry Neblett May 07, 2019 12:36

  I think for the best response, you should submit a ticket with support. This is a user-to-user forum and your issue is fairly specific which may limit the number of people who have a similar set-up and issue as you. Hopefully anyone else who can help from the forum, will do so, but there is no guarantee.  

• 0
  
  Krzysztof Pogłodziński May 07, 2019 14:12

  So after finding a solution with support I will leave here the answer - maybe it will be helpful to someone in the future. :)

• 0
  
  Pramod Poonit July 05, 2019 07:34

  We got the same issues here too and still struggling to find a solution.

  Have you been able to find a workaround?

• 0
  
  Wintellab2 September 13, 2019 12:28

  Hi, you were able to solve the problem for the tg800 voice

   

  Fernando

• 0
  
  Giuseppina Moronese October 30, 2019 18:23

  We have the same problem here:

  • hw version 1.20
  • firmware 91.3.0.3 
  • 4 sim inserted, with gsm signal from -53 to -60dbm
  • local pbx with sub 1ms connection

  Only some times calls to and from the asterisk pbx works with
  good audio quality. Most of times the call quality is very low.
  Even with rx and tx volume set to 60% under gateway section.
  Dedicated managed gigabit switch with pbx, voip phones and tg800.
  We have some smartphone with same gsm carrier with no quality
  problems.

  Any ideas?

  We need this type of product, but with these problems it is not USABLE.

  Please, give advice.

  Thanks,

  GM

• 0
  
  Mmalek August 23, 2020 11:05

  I have the same issue, Yeastar GSM gateways is not giving a perfect voice quality! 

• 0
  
  Paul March 18, 2021 08:51

  Hi, Any updates on this. We also have this issue.

• 0
  
  Krzysztof Pogłodziński March 18, 2021 11:52

  Hi!
  GSM modules in standard TG800 is a crap.
  Only solution which worked for me: sell TG800 and buy TG800 LTE. :-( 

• 0
  
  Paul March 19, 2021 00:21

  Hello Krzystof,

  Oh No! How can I distinguish the TG800 from TG800LTE? I just purchase it last year and ever since I get complains on it.

  Here's 

  Product Type: TG800 Hardware Version: V1.20 0000-0000 Firmware Version: 91.3.0.21

  Is this TG800 LTE?

• 0
  
  Krzysztof Pogłodziński March 19, 2021 06:40

  Whole platform is the same, but 8 different GMS modules are installed inside.
  Via WWW interface on status page after hovering over 'Trunk<nr>' you will get some GSM module details for that Trunk. Here is screen of LTE module installed Trunk1, currently connected to 4G network (but even if GSM operator does not support 4G, LTE modules will still have better quality on 3G network then standard ones):

  
  This was the main way for me to improve quality of calls.
  I also notices some minor improvement after switching from jack headphones to USB ones. It's definitely cheaper way than replacing TG800, so you might start there - maybe it will be good enough for you.
  Good luck! :)

• 0
  
  Paul March 19, 2021 07:13

  Thank you for the info Krysztol! 

• 0
  
  Mmalek March 19, 2021 11:07

  i shifted to Dlink gsm and worked very fine. Yeastar is not giving any proper solution!