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Increasing the Handset Volume of a CP-500 Cisco IP Phone

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Some customers have complained about voice quality issues on the CP-500 phones, especially low volume through the handset. The following procedure describes how to modify this by increasing the default gain of the device.


IMPORTANT: This procedure could be used to change other default configuration parameters on the phone, but this is emphatically discouraged AND NOT SUPPORTED BY TAC.


Procedure:

1) Using notepad, create a file called "cp-524G-cfg.xml" with the following content:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<flat-profile xmlns="http://www.sipura.net/xsd/CP524SG" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.sipura.net/xsd/CP524SG http://www.sipura.net/xsd/CP524SG/CP524SG-8-1-16.xsd">
<!-- Audio Input Gain (dB) -->
<Handset_Input_Gain ua="na">6</Handset_Input_Gain> <!-- options: -6/0/6 -->
</flat-profile>

In the above example, the new dB gain is +6dB (which might be too loud). We recommend that you start with 3 dB.


2) Put this file on the UC500 flash, specifically the "phone/521_524" directory, where the phone load is stored.

3) Create a TFTP Server entry via CLI, to instruct IOS to serve this file (use verbatim syntax, as shown below):

tftp-server flash:phones/521_524/CP-524G-cfg.xml alias /CP-524G-cfg.xml

4) Reboot your phone. If you have "debug tftp events" enabled, you can monitor the TFTP server activity (some output omitted below):


Jun 10 23:59:47.238: TFTP: Looking for /CP-524G-cfg.xml
Jun 10 23:59:47.282: TFTP: Opened flash:phones/521_524/CP-524G-cfg.xml, fd 11, size 416 for process 280
Jun 10 23:59:47.346: TFTP: Finished flash:phones/521_524/CP-524G-cfg.xml, time 00:00:00 for process 280

5) Check the new settings by opening a browser and point it to the phone IP. Look under the phone menu and check "Handset Input Gain":

Picture 1.png

You can also verify the new settings by pointing your broswer to the following URL, in order to see the raw XML configuration:

http://<IP_of_device>/admin/spacfg.xml

Comments
Beginner

Just to be sure of it, does this procedure work for the CP-521 as well?

Collaborator

Yes it should.


Marcos

Beginner

On the thread which generated this document, you said that you were working on a procedure to change the configurations of all phones at once (which you did). Is there a mechanism to change the gain on only some phones?  And if so, does that mechanism peacefully co-exist with this method, or are they mutually exclusive?

thanks!

David.

Collaborator

You can create XML files per phone (using their MAC address). Do a debug TFTP events while you restart the phones and you will see how you will have to format the file name.

Thanks,


Marcos

Beginner

I'm having trouble following your directions Marcos.  I started a discussion about it to save cluttering up the comments here.

Beginner

I've been having a nice conversation with myself as I follow this through.  It's come down to this now though: exhaustive analysis of debug tftp events has NOT suggested any way to to configure the handset gain on a per-phone basis.

Beginner

Hi,

Is there a way to change the input gain for Cisco 7910 IP phones ?

Can the XML configuration for the phone be obtained via the web URL ?