Orange Mobile Network - poor Voice quality

[NYCCGaz]

Hoping for some assistance here.

For quite a few months now we have been receiving fault calls from users who when dialling out from our system to a mobile - receive very poor call quality.
We run a Mitel estate and use SIP and GSM Gateway (o2 sims)
We have battled for weeks to try and prove the fault and diagnose it to no avail.
The only common denomonater is that the mobiles which report the problem are all Orange mobiles.
The fault is that when the call is connected - the mobile user cannot hear anything from our customer, what they can hear is "muffled" "sounds underwater" - they end the call and return the call and the quality is fine.

Im interested to see if anyone else has had a similar issue?

Cheers

 

[Sympology]

Oooo this sounds like an issue we have!
If calling from a mobile it's ok, but when routing via SIP > PSTN (ISDN 30 lines) we have a similar issue.
Also started a few weeks ago.
Symptoms.
When calling one end gets silence, or rings once and goes to Voicemail, or repeatedly rings phone once, says diverting, then rings again, says diverting, rings again.
Users can get several missed call alerts for a single call.
PBX shows as single call.
Totally random, but seems only to affect Orange / EE mobiles.
We recently ported from O2 if that helps.

Robert Wilensky:
We've all heard that a million monkeys banging on a million typewriters will eventually reproduce the entire works of Shakespeare. Now, thanks to the Internet, we know this is not true.

http://alvechurchlounge.org.uk

 

[Sympology]

Also look here:

http://community.spiceworks.com/topic/360048-uk-ee-mobile-network-issues

Robert Wilensky:
We've all heard that a million monkeys banging on a million typewriters will eventually reproduce the entire works of Shakespeare. Now, thanks to the Internet, we know this is not true.

http://alvechurchlounge.org.uk

 

[NYCCGaz]

Sounds like a similar problem if not identical.
Our issue does seems to be from our system to Orange Mobile, we dont get too many mobile-mobile calls.

We recently ported our GSM away from Orange to O2 (cost saving rather than performance related) and we hiped this would solkve it as we were adament it was the GSM causing the issue.
Since then we still get the problems.

We have a group of users who this particularly affects, who have provided us with a list of mobile numbers,
We routed half these numbers over SIP and half over GSM.
We still get reports of poor quality thorugh both "halves" leaving us pretty sure our systems are running ok.

Only seems to be Orange/EE with the issue. Although with the known iphone signal problems its sometimes hard to differentiate. Our mobile users use basic Nokia/blackberry devices.

 

[Sympology]

Yup just had confirmation a lot of the ones being affected are pretty basic handsets, so not 4g for us.

Robert Wilensky:
We've all heard that a million monkeys banging on a million typewriters will eventually reproduce the entire works of Shakespeare. Now, thanks to the Internet, we know this is not true.

http://alvechurchlounge.org.uk

 

[NYCCGaz]

I have spoken to our GSM providor and they checked our system is ok - but they also confirmed the get similar issues across the country. All of which orange related.