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Why do IP phones/CallManager go out on port 2000 on data gateway?

DHCP server gives computers and IP phones IP address, data gateway, DNS. Same DHCP server gives phones IP address, DNS.

I see on CheckPoint firewall that every phone sends requests on port 2000 on data gateway. Firewall is blocking that port, but IP phones communicate normally.

Why do Ethernet Phone Port send that data???

Thanks

1 ACCEPTED SOLUTION

Accepted Solutions
Cisco Employee

Re: Why do IP phones/CallManager go out on port 2000 on data gat

Port 200 is used for the SRST feature for remote gateways:

http://www.cisco.com/univercd/cc/td/doc/product/voice/c_ipphon/srst/

If you are not using SRST, blocking this port will not affect the phones.

1 REPLY
Cisco Employee

Re: Why do IP phones/CallManager go out on port 2000 on data gat

Port 200 is used for the SRST feature for remote gateways:

http://www.cisco.com/univercd/cc/td/doc/product/voice/c_ipphon/srst/

If you are not using SRST, blocking this port will not affect the phones.

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