AL; Reviewed:
SPOC 8/24/2006
Solution & Interoperability Test Lab Application Notes
©2006 Avaya Inc. All Rights Reserved.
21 of 23
JNPR-M7i-J4300
6.1. General Test Approach
Quality of Service was verified by injecting simulated data traffic into the network using a traffic
generator while calls were being established and maintained using the Avaya IP Telephones. The
J4300 router was configured to perform as a DHCP Server to test DHCP option 176 used by the
Avaya IP Telephones. DTMF detection was tested using the Intuity AUDIX Voice Mail system
configured in the S8300 Media Server.
The objectives were to verify the Juniper M7i and J4300 routers support the following:
• QoS for VoIP traffic
• Compressed RTP over Point-to-Point Protocol
• Point-to-Point Protocol
• DHCP Server support for Option 176
• AES-encrypted VoIP traffic
• Basic calling (e.g. call, transfer, conference, DTMF detection)
6.2. Test Results
The Juniper Networks M7i and J4300 routers successfully achieved all objectives. Quality of
Service for VoIP traffic was maintained throughout the testing in the presence of competing
simulated traffic. No degradation of Voice quality was detected through the use of compress RTP.
The Avaya IP Telephones successfully received appropriate IP addresses from the J4300 router and
registered with the correct server. AES-encrypted VoIP traffic was successfully established and
maintained through the WAN network.
7. Verification Steps
The following steps may be used to verify the configuration:
• Place inter-site calls between the Avaya IP Telephones.
• Use the “show service crtp flow” command on the Juniper router to verify that RTP traffic is
being compressed.
• Use the “show interface queue” command on the Juniper router to verify that VoIP traffic is
being prioritized correctly.
• Use the “show class-of-Service forwarding-table” command on the Juniper routers to verify
that the appropriate bandwidth is being assigned on the interfaces.
8. Support
For technical support on the Juniper Networks product, contact Juniper Networks JTAC at
(888) 314-JTAC, or refer to http://www.juniper.net
9. Conclusion
These Application Notes have described the administration steps required to configure Juniper
Networks M7i and J4300 routers to support Avaya Communication Manager and Avaya IP
Telephones.
