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MGCP Gateway Registration Failure with Cisco CallManager

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Problem Description:

================

MGCP gateway not able to register to CUCM, where a "Check-point Firewall" is between the CUCM and the Gateway.

Analysis:

========

Call-flow:

========

 IP-PHONE>>CUCM>>>(CHECK-POINT/FW) / MGCP>>>>>GW>>PRI>>PSTN

 

The endpoint (PRI) on the CUCM show’s as registered.

While on the gateway, shows the following:

Cisco.ca#sh ccm-manager

MGCP Domain Name: Cisco.ca

Priority       Status                   Host

============================================================

Primary         Registering with CM     122.192.180.18

First Backup   Backup Ready             122.192.180.19

Second Backup   None

From the packet capture taken from the CUCM we see that he source port changes to 10000 on the Check-point sent to the CUCM:

This is a known bug on checkpoint which is related to sk102049:

https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doGoviewsolutiondetails=&solutionid=sk102049

Checkpoint does not recognize RSIP message from CUCM as a valid protocol. Configuring the protocol to MGCP on the firewall rule will fix the issue.

Resolution:

==========

Work with Checkpoint team to fix the issue. They should not be modifying the source port from 2427 to 10000.

Comments
Cisco Employee

[+5] Kevin. Keep up writing these documents!!!!

Regards

Deepak

Advisor

good Troubleshooting trick[+5]

regds,

aman

Cisco Employee

Good one :)

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