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Avaya IPO500 Poor Voice Quality

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BestPal

BestPal

Technical User
Feb 21, 2006
24
NL
We have several customers that complain IPO500 system (running on R5/R6) with poor voice quality; no matter on local LAN with IP phoneset, or intra-network for remote offices.
We tried to check with system status and network, but no packet drop or abnormal network broadcasting message... It may temporary resume back to normal after system reboot.
Please state if there is any idea or hints how to fix it, thx a lot!!
 
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What codec do you use?


BAZINGA!

I'm not insane, my mother had me tested!
 
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How many phones? How many channels connecting the sites?

Was there a network assessment done? Did an authorized business partner install it?


 
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amd if customers go from TDM phones to IP phones, they will always sound different (worse in the cuwtomer eyes!!)

This happens what ever system you fit. TDM or IP. Every phone is diffenrent and sounds slightly different.

Get them to log the problems and details of the calls, get SSA and monitor tracing from the same timescale and see what come of that.

The IP500 is a v good platform. the 14xx/16xx phones do sound a little worse than a 96xx phone, but you get what you pay for!!

Jamie Green

Football is not a matter of life and death-It is far more important!!!!
 
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We have tried to use G.729 (default) and G.711 but it seems no improvement for customer... at least the customer did not accept the voice quality.
Refer to customer system configuration, most of phonesets may use of IP16xx but it is also found the problem even on 96xx phoneset.
Is there any document/tech. note that may get more information how we could fix it? We really lost the way to go...
 
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Is there any document/tech. note that may get more information how we could fix it?"

This comes down to having a sound knowledge of IP communications and how network configuration and data traffic effects voice quality, each site has it's own factors effecting voice quality and as such there is no single document that will fit every scenario, you need to troubleshoot the issue until fixed.

G711 will give a marked difference in voice quiality over G729 in a correctly set up newtork, if it didn't they have something else causing the issue other than the system I think :)

ACSS (SME)
APSS (SME)


"I'm just off to Hartlepool to buy some exploding trousers
 
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You need to be a bit more precise here;
Calls that are "poor" are they
1) Station to station
2) Station to trunk
3) trunk to station
4) otehr types of call

What sort of lines do you have?



Take Care

Matt
I have always wished that my computer would be as easy to use as my telephone.
My wish has come true. I no longer know how to use my telephone.
 
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We have tried both G729 and G711 but it seems no different... at least the customer is still not accept :(
The network is convergent voice and data; i.e. PC plug into phoneset and use same LAN cable for connecting to LAN switch. Almost all phoneset are IP 16xx (e.g. 1616i, 1608i, etc.). Is there any bug list on IP 16xx phoneset for voice quality?
 
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The 1600 is a cheap phone.
Why is it cheap?

It uses cheap components so it sounds cheap!


BAZINGA!

I'm not insane, my mother had me tested!
 
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If they have a converged network they need QoS setup and Vlans too (this is true of any IP system on a converged network), packet drop is not a measure of suitablity for VoIP. So that's the ball back in the IT mans court, until that's sorted he will have quality issues (and it will be the network) :)

ACSS (SME)
APSS (SME)


"I'm just off to Hartlepool to buy some exploding trousers
 
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As customer site existing IT infrastructure was design for data network only, those networking equipment may not support Qos and VLAN setup. We just tried to loan a pair of router to enable RTP priority first but seems no improvement.
The customer request us to provide "solid" supported information how it could fix those issues... In other words, it will make a BIG trouble if get failure!! Is there any information can be share with us?
 
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Tell the customer to get managed switches s that there can be vlans configured.
Also a router or layer3 switch is needed for QOS.
Only then you can solve this.
So tell the customer to upgrade his network otherwise you will fail.
You cannot solve it without there help.


BAZINGA!

I'm not insane, my mother had me tested!
 
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>As customer site existing IT infrastructure was design for data network only

There you are.

>Tell the customer to get managed switches s that there can be vlans configured.

This is a requirement if you have mor ethan about 5 phones deployed.



Take Care

Matt
I have always wished that my computer would be as easy to use as my telephone.
My wish has come true. I no longer know how to use my telephone.
 
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If they want to run VoIP then they need a network fit and configured for VoIP, if they choose not to so they can save money then they will have to live with the issues, what we have suggested is the only way to fix it, there is no cheat or workaround which is what they think you can deliver....you can't :)

ACSS (SME)
APSS (SME)


"I'm just off to Hartlepool to buy some exploding trousers
 
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The main point is how we could prove to customer on network upgrade with QoS deployment. For the customer, it may involve a large amount of cost, and impact on networking operations interruption.
If the customer do those things that we stated but no or not as expected improvement, we will...
We have to get with well planned before action.
 
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You do not need to prove it.
It has proven itself already, the quality is bad :)


BAZINGA!

I'm not insane, my mother had me tested!
 
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>The main point is how we could prove to customer on network upgrade with QoS deployment


Simple - put in a new dataswitch on the second LAN interface of the IP500 and run a completely seperate netwrok for phones on that.

However, I wondering about your competency as an integrator - this is teh kind of issue that gives the IP office a poor reputation.

Take Care

Matt
I have always wished that my computer would be as easy to use as my telephone.
My wish has come true. I no longer know how to use my telephone.
 
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We are only engineer to implement and support service, but consultant to design and discuss with customer for the system... Because of cost implication, consultant does not want to get involve to state with customer but engineer have to discuss with customer and fix it... Actually it is design problem, but finally we need to suffer but no one support :(
 
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