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Cisco Cisco IOS Software Release 12.4(2)T

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NAT Optimized SIP Media Path with SDP
  How to Configure NAT Optimized SIP Media Path with SDP
3
Cisco IOS Release 12.4(2)T
SUMMARY STEPS
1.
enable
2.
configure terminal
3.
ip nat piggyback-support sip-alg sdp-only router router-id [md5-authentication 
md5-authentication-key]
DETAILED STEPS
Configuring a NAT Optimized SIP Media Path with SDP Messages Without MD5 
Authentication
Perform this task to configure SDP messages with a NAT optimized SIP Media path without MD5 
authentication.
SUMMARY STEPS
1.
enable
2.
configure terminal
3.
ip nat piggyback-support sip-alg sdp-only router router-id 
Command or Action
Purpose
Step 1
enable
Example:
Router> enable
Enables privileged EXEC mode. 
•
Enter your password if prompted.
Step 2
configure
 terminal
Example:
Router# configure terminal
Enters global configuration mode.
Step 3
ip nat piggyback
-support sip-alg sdp-only 
router 
router-id md5-authentication 
md5-authentication-key
Example:
Router(config)# ip nat piggyback-support 
sip-alg sdp-only router 100 md5-authentication 
md5-key
Enables SDP messages with a NAT optimized SIP Media 
path including MD5 authentication.