Are there any config settings for controlling echo in SER ? I have a Grandstream HT-486 connecting to SER then to Asterisk. There is a bad echo when calling from the SIP side, asterisk has several methods of canceling echo, but in this case have no effect. --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.707 / Virus Database: 463 - Release Date: 6/15/2004