Cisco 867 Router & Toshiba CTX System

Misan

Misan

Misan

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Joined
17 Nov 2006
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123
Location
Manchester
Hi guys - I'm hoping someone can assist with better experience with Cisco IOS than me.

I have a Cisco 867 router at a client site with a static public IP address. Behind this is a Toshiba CTX phone system with two interfaces. One interface has been assigned a non-routable IP and is connected to a Cisco switch. The second interface (which appears to be a VOIP card) has a public IP address assigned to it.

What I would like to do is be able to route traffic from the VOIP interface to the outside world. I've asked Toshiba regarding this setup, and they state that the VOIP interface MUST have a public IP address for the phone system to work correctly - In fact this was working fine on the old Draytek 2820 router which allowed Multi-NAT - However this device has been decommissioned.

I have been using CCP to configure the device, but can access the CLI if required.

Many thanks for any help!
 
They are feeding you rubbish. Is it SIP? you need to enable a 1 to 1 NAT on the router for the relevant internal IP and disable SIP port NAT

i.e.
ip nat inside source static 192.168.10.10 1.2.3.4 extendable
no ip nat service sip udp port 5060

Depending on how it's done, you may also get away with an inbound port forward with outbound NAT overload

- GP
 
GhostlyPea said:
They are feeding you rubbish. Is it SIP? you need to enable a 1 to 1 NAT on the router for the relevant internal IP and disable SIP port NAT

i.e.
ip nat inside source static 192.168.10.10 1.2.3.4 extendable
no ip nat service sip udp port 5060

Depending on how it's done, you may also get away with an inbound port forward with outbound NAT overload

- GP
Click to expand...

You might need to do even more than no ip nat service sip... I've had some pretty horrible battles with SIP through NAT before now.
 
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