Q3: Why Do I Hear A Fast Busy Tone When Making Outgoing Calls (Even Though Sip Parameters Have Been Configured); Q4: How Do I Troubleshoot Voice Echo; Figure 10: Configuring Proxy's Domain Name In The Web Interface - AudioCodes MP-20 Series Frequently Asked Questions Manual

Q3: Why do I hear a fast busy tone when making outgoing calls (even though SIP
parameters have been configured)?
A: The fast busy tone may be caused by the Proxy server not been configured with a domain
name:
To configure the Proxy with a domain name:
1. Logon to the Web interface.
2. Access the 'Voice Over IP' screen (Voice Over IP menu), and then select the Signaling
Protocol tab.
3. Under Signaling Protocol group, in the Gateway Name – User Domain field, enter the
Proxy's domain name.

Figure 10: Configuring Proxy's Domain Name in the Web Interface

Q4: How do I troubleshoot voice echo?
A:
If you hear the echo, then the echo is caused from one of the following sources:
Your own handset: try replacing the handset with a new one.
The remote party: notify this to the far-end for it to resolve this issue.
If the echo is heard by the remote party, ensure that echo cancellation is activated in
MP-20x:
a) Logon to the Web interface.
b) Access the 'Voice Over IP' screen (Voice Over IP menu), and then select the Voice
and Fax tab.
c) Under the Echo Cancellation group, select the 'Enable Echo Cancellation' check box.
AudioCodes Customer Support
Page 14