List, I have begun to experience a strange echo problem on our internal network. The problem starts when "User A" calls "User B", "User A" puts "User B" on hold. "User B" heres the on hold music. "User A" returns and "User B" has trouble echo. I am using FC1, Asterisk 1.0.9. This electronic message transmission, including attachments, is for the exclusive use of the individuals to which this e-mail is addressed and is to be reviewed and used exclusively for authorized company purposes. This transmission may contain proprietary, confidential or privileged information. If you are not the intended recipient of this transmission, you are hereby notified that any use, copying, disclosure, dissemination, distribution or taking of any action in reliance upon the contents of this transmission is strictly prohibited. If you believe you may have received this electronic message in error, please notify the sender immediately by return email and delete or destroy the original message and/or any copy of it from your computer system and/or your files. Thank you.