Troubleshooting Hairpinning Common Problems; Sip Alg Interoperability With Avaya Call Servers; Ability To Enable/Disable Firewall Algs - Avaya 1000 Series Configuration Manual

NAT Configurations

Troubleshooting Hairpinning Common Problems

• Phones do not register
check network connectivity and policy between the phone and the call server
• One way or no audio between private phones
Turn hairpinning on. (Default is off)
• One way/no audio between private phones and hairpinning is on
- If using UNIStim: ensure Phones and Call Server are using STUN or echo server
- If using SIP: endure sip-alg is on (default is on)
• For Isolation, try NAT avoidance

SIP ALG Interoperability with Avaya Call Servers

Ability to Enable/Disable Firewall ALGs

All the firewall ALGs are enabled by default when the firewall is configured. It can become
necessary to selectively disable ALGs in the firewall when applications fail due to
120 Avaya Secure Router 1000 Series Configuration Guide December 2010