I have been able to workaround the issue of low volume in the Polycom 320 and thought I'd share my findings.
As mentioned in a previous email, while looking through the Polycom admin guide I found some advanced features for audio gain. The latest admin guide can be found here: http://www.polycom.com/support/voice/soundpoint_ip/soundpoint_ip330_320.html There's no description of what these different settings do so I had to figure it out on my own. Here's what I've come up with (I doubt the technical terms are correct, but it should give you a general idea): rx: receive gain in dB tx: transmit gain in dB analog: sets overall gain digital: sets initial volume chassis: speakerphone handset, headset and ringer: self explanatory sidetone: ? Many settings allow specific values for different models. Some just have a generic setting with no model listing. If the model of interest is listed, I believe that is the one that should be used. The volume that I was really interested was the speaker part (rx) of the speakerphone (chassis). Therefore, the settings I wanted to change were voice.gain.rx.analog.chassis.IP_330 (overall gain) and voice.gain.rx.digital.chassis.IP_330 (initial volume). I quickly found the following file, which appeared to have all of the settings with the defaults set: /etc/sipxpbx/polycom/polycom_sip.cfg. The defaults for the above settings were 0 and 5 respectively (also mentioned in the admin guide). The next thing I needed to do was set this value in sipXecs. There is no user interface at this time for the gain settings, so I did a bit of research and found that best place to change this is in the /etc/sipxpbx/polycom/mac-address.d/sip.cfg.vm file. Please see the following page for more info: http://sipx-wiki.calivia.com/index.php/HowTo_configure_Polycom_SoundPoint_IP _phones_with_sipX#Changing_Polycom_Profile_Templates I ended up adding the following between the volume and vad settings: <gains voice.gain.rx.analog.chassis.IP_330="12" voice.gain.rx.digital.chassis.IP_330="12" /> After making this change I resent the profile to the phone. After some testing, I found these are the ideal settings for us for the speakerphone. The initial value (digital) is probably a little on the loud side, so voice.gain.rx.digital.chassis.IP_330 may end up being lowered to around 9 in the end. I have noticed a number of people mention the initial volume level of the handset is also a little low. If you'd like to change this, you would probably need to change the voice.gain.rx.digital.handset value (there is no model specific setting for this). The default is set to -15. Bumping this up to around -12 may be sufficient (testing is required). To wrap this up, I should mention that Polycom recommends not changing these settings. If you decide to change them, I recommend changing the values in small increments to ensure you don't cause any other issues. However, we have made a number of test calls and have found that there is no noticeable impact in the call quality (i.e. echo). We are very happy with the changes so far. HTH, Tim _______________________________________________ sipx-users mailing list [email protected] List Archive: http://list.sipfoundry.org/archive/sipx-users Unsubscribe: http://list.sipfoundry.org/mailman/listinfo/sipx-users sipXecs IP PBX -- http://www.sipfoundry.org/
