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ADTRAN IP SoftPhone User Manual Appendix A: Troubleshooting
61950859L1-1A Copyright © 2006 ADTRAN, Inc. 47
Two additional ports after 8001 are required for each additional line used. For example, if using a second
line, UDP ports 8002 and 8003 are used.
If the firewall restricts incoming connections, you may need to use an outbound proxy to properly receive
audio. Ask the VoIP service provider for an outbound proxy address and port number; then enter those
values into the ADTRAN IP SoftPhone in the following location:
Settings Menu -> Firewall/NAT -> Firewall Outbound Proxy -> <Host>
Users must also set the
Use Outbound Proxy field (found with the above setting) to Always.
Port forwarding is not required on a NAT.
Multiple IP Addresses on the Same Computer
If a user’s computer has more than one IP address, the ADTRAN IP SoftPhone may have difficulty
choosing the correct address for softphone calls. To set the correct IP address manually, configure the
following settings as instructed below:
Settings Menu ->
System -> Network -> Auto-Detect IP Address: Unchecked
Local IP Address: [User Computer’s IP Address]
NAT Firewall IP Address: [IP Address of the user’s NAT or firewall]
Another solution is to disable all but one network adapter until after the ADTRAN IP SoftPhone starts.
RPort Attribute
Some VoIP providers do not support the “rport” signaling attribute. Check with the VoIP service provider
for details. To turn off “rport,” configure the following setting as instructed below:
Settings Menu ->
SIP Accounts -> [User’s Proxy] -> Advanced -> Use rport: Unchecked
Audio Problems
This guide assumes that the computer’s sound and video system are working normally, and that the Tuning
Wizard has been run at least once. To run the Tuning Wizard, right-click over the dial pad, and select
Tuning Wizard.
Table 8. Standard Ports
Port Type and Number Service
UDP 3478 STUN
UDP 5060 SIP
UDP 8000 RTP
UDP 8001 RTCP