[Asterisk-Users] Polycom 501 horrible echo

[Douglas Garstang]

You aren't making calls from one phone to another, with them right next to each other on the same desk are you? 
 
Doug.

	-----Original Message----- 
	From: Jeff Herring [mailto:jeffh at sldsi.com] 
	Sent: Mon 1/23/2006 6:46 PM 
	To: asterisk-users at lists.digium.com 
	Cc: 
	Subject: [Asterisk-Users] Polycom 501 horrible echo
	
	

	I have the following situation:
	
	Asterisk 1.2.1
	25+ Polycom 501 telephones. Bootrom 2.6.2.0032 Application 1.6.2.0041
	Some 501's local to my network, some across the great INTERNET divide.
	PRI connected to Sangoma card.
	
	Issue: horrible echo (and squeals, and "underwater-like" sound) on speaker
	phone when calling from extension to extension.
	
	echo not present when calling outbound using PRI or when receiving calls
	from PRI.
	echo not present when using handset or headset in any case.
	
	All gains, etc. are as listed in the Polycom Admin Guide.
	
	Not specific to any phone, or its location on our network.
	
	I suspect the issue is related to the echo cancelation HW in the speaker
	phone, but
	I'm not sure...The unfortunate thing is these phones were purchased because
	of their
	excellent speaker phones which now appear to be worse than the Grandstreams!
	
	Anyone with thoughts of where to start?
	
	TIA - Jeff H.
	
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