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4621SW Voice Quality Issues

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vaniello

vaniello

IS-IT--Management
Dec 21, 2004
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We recently switched a few users on our IP Office 406V2 3.1(56) system from digital phones (4412D+) to IP phones (4621SW). The voice quality on the IP phones is poor compared to the digital phones, particularly on speakerphone. Does anyone have any tips for improving voice quality? The users are currently on a local LAN dedicated to the phone system, but we plan on also connecting users across the WAN to the IP Office system.

Would upgrading to the latest 4621SW firmware (46xxSIP_040706) help? In order to upgrade do I just need to place the new firmware files in the C:\Program Files\Avaya\IP Office\Manager directory and have the phone access the new firmware via TFTP?

Thanks in advance for your assistance.

V/


 
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I've noticed that the digital phones are clearer and cleaner when compared to the IP phones. Even with the G711 codec, the digital phones sound better. The quality is especially noticable when you have the handset or speaker volume all the way up. What I've done, is boosted the gain on the lines so that users don't have to crank the volume all the way up, then the quality of VoIP isn't so noticable.
 
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I didnt think the 4621 phones were supported? where did you get the bin files? or am i confused again
 
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Our phone system vendor provided the phones and the bin files. Is there a list available of what phones are supported by IP Office?

V/
 
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Umm, not to be dense, but where can I find the toolkit?

V/
 
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The compression mode is set to Automatic Selection. Should I hard code it to a particular type of compression?

Thanks.

V/
 
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well being this is a LAN environment, changing the codec to ULAW G711 64K from automatic will definatly improve the quality. It will require more bandwidth per phone, so use your best judgement for what fits for the customer. I ust all G711 for our ip phone installations, haven't had any problems. Going across a WAN is a different story.
 
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I changed the codec to ULAW G711 64K and don't see much of an improvement. Do I need to reboot the phone system for the change to take effect or will a config merge suffice?

Also, from your experience what is the optimal gain level for the IP phones?

Thanks.

V/

 
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Yes, it's a reboot change for it to take effect. I put the gain level on the analog lines themselves, not the IP phone. It's the Tx gain I changed under the analog line form (for recieved volume, from Analog--->Digital, A-->D) I haven't messed with the gain settings on IP Phones themselves. This allowed the user to not have to crank up the handset volume all the way up.
 
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