I'm having a weird problem with my freshphone account. About half the numbers I dial are completely unusable when someone answers the phone. The line goes garbled and you can't understand a word on the other end. I use G.729 protocol and the licences and everything are sorted and all is working. 

For some reason it doesn't do this with all phone numbers. Only a handful. Any ideas? My line latency reports as 5-10ms and I've turned off the weird SIP nonsense that is supposed to be a troublemaker on the router to no avail.

Thank you. The date today is 29 Nov 2019.

I first phoned 0216837821 for 24s at 08:14, because that number was a problem yesterday, but today it was perfect.

Then, I phoned 0216743134 for 15s at 08:17, because I remember that number being a problem in the past. Sure enough, the incoming audio was garbled. I asked them whether they could hear me properly (so you may be able to hear their response - I couldn't understand it). My Zoiper5 app (version 5.2.28 for Linux 64bit) on my Linux Mint 19.1 Tessa 64-bit computer (kernel Linux 4.15.0-70-generic x86_64) tells me that the local codecs for the call was Opus/16000 and remote codecs also Opus/16000, with the call quality rated "excellent".

Hi Fresh Man

I have not yet bought Zoiper Pro (which will cost R650 I believe). Today, I had two calls to land lines that had bad jitter - 0219121800 and 0216722500, which I called at 11:09 and 11:12 respectively, lasting 9s and 4s respectively.

I then used an alternate number to call 0216722500 at 11:18 - I used my MWeb Talk number. Behold! The line had no jitter. (This indicates which provider I will use in future.)

I thus find Freshphone's quality unreliable, for when I call land lines. I have made a number of calls to cell phones today, so the problem seems to only be with land lines.

Hi Fresh Man,
I am using an Asus RT-AC68U running latest Merlin firmware. I have tried with SIP passthrough turned on and off. I have tried QoS on with VOIP prioritised, at the bottom, in the middle and QoS off. It was doing the same thing when I was running on a 10Mbps Openserve fibre line as it is now doing on a Vumatel 50Mbps line. The Equipment is a Yeastar TA100.

I have tried it on Zoiper and even straight through my Android phone using it's built in SIP protocol. It does the same garbled nonsense on everything. I would tend to agree with you that it could be internet, but then it's been tried on 2 fibre lines, and then my phones LTE connection as well. You can phone one number and it's garbled, phone another number and it's crystal clear, then phone the other number again and it's garbled. That doesn't seem like internet connection to me.

I think it's a problem, possibly not even on your side, but maybe even on the switch from VOIP to analog or however it gets done to non-VOIP numbers.

 

Hi, was away on leave the last 3 weeks. Same problem. Phone one number and it's garbled, phone another one and it's fine, phone the same number that was garbled before and it stays garbled. I was using it while I was overseas now on my cellphone and the time connected doesn't show much because sometimes it would show connected for ages but there would be nothing happening, no ringing, nothing.

 

I'll give it a try and let you know.