The humming noise comes from the Power units of these devices and has nothing to do with the quality of the SIP device. You can reduce this noise if your power unit has a longer cord or if you are using an expensive Power unit that has similar input and output.
We found this problem on our netweb-301 / 302 phones wherein when we used the Australia (220 V) Only Power unit, in Sydney, it has humming noise. But when we use the 110-240 V Power units in USA, which are a little expensive, our phones work pindrop perfect. Hence we are supplying the 110-240V dual power units only on all our IP Phones sold now. Seshu http://ipphone.eezeephone.com 732-213-2422 -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Rafael J. Risco G.V. Sent: Wednesday, October 20, 2004 10:53 AM To: Asterisk Users Mailing List - Non-Commercial Discussion Subject: Re: [Asterisk-Users] Wonderful Success with PAP2-NA I have 2 of this PAP2, its a good product and it works with SER+Asterisk very well but it is not perfect, I can feel this humming noise on the line and I think it would be perfect if this device had more codecs like gsm or iLBX to better interaction of asterisk ivr voicemail and lower BW consumption when talk with x-lite, sjphone etc... -------------------------------------------------------- NOTICE: If received in error, please destroy and notify sender. Sender does not waive confidentiality or privilege, and use is prohibited. _______________________________________________ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
