No dial tone on RTP300 behind Cisco 831

Posts: 5 · New Forum Member Joined: Aug 27, 2008 Posts: 5

Ok. I've set up my network at the house like this:

Cisco 831 -> Linksys WAP
|
|
Vonage RTP300

In other words the WAP and RTP300 are each on their own port off of the Cisco. I followed the suggestion about connecting the RTP300 to the router via the RTP's WAN port, no go. I get no dial tone.

Then I followed an example here where it said to connect a cable to the WAN port into port 3 and another cable into port 1 back to router. No go again. I've tried all variations of cabling including using actual cross-over cables and I cannot get dial tone.

The Cisco is configured as my firewall/vpn server/router. All of these are required. The firewall is configured with both CBAC and static packet filtering. Please, any help is appreciated. I need to get this resolved.

The ISP is Road Runner and I'm located in Central FL. The modem itself is a Motorola and works fine. I can get dial tone if I connect the RTP300 to the Cable Mode, but not if the Cisco is acting as the router.

Posts: 39 · Vonage Forum Junior Joined: May 22, 2007 Posts: 39

The only reason you would not have dialtone behind the Cisco router would be if the RTP300 was unable to complete its SIP Registration.

As to why it cannot REGISTER I dont know. There has to be a rule set somewhere in your Cisco router that is preventing this from happening. Open up some routes for this device and you should be good to go. If you think you already accounted for this, then obviously you didn't since you do not have dialtone yet.

Posts: 4694 · Vonage Forum **MVM** Joined: Aug 30, 2005 Posts: 4694

Agreed. As an alternate to troubleshooting the Cisco settings, you could try putting the RTP300 first, which you know works, and putting the Cisco behind it. That should be satisfactory if- and only if- your internet usage is not too demanding.

Posts: 5 · New Forum Member Joined: Aug 27, 2008 Posts: 5

Thank you both for your replies. The Cisco is in front becase it is acting as my VPN server as well. I've just added these two lines to my inbound ACL:

permit tcp any any eq 5060
permit udp any any eq 5060

After my linux box is done updating I'll try and swap devices again.

Posts: 204 · Vonage Forum Master Joined: Dec 04, 2005 Posts: 204

Actually Vonage uses UDP port 10000 for SIP, not 5060. The port range of 10000-20000 is used for media (RTP audio), also UDP. If your Cisco runs a recent version of IOS, it has native VoIP QoS that you can enable as well.

Posts: 5 · New Forum Member Joined: Aug 27, 2008 Posts: 5

I opened up ports 10000 to 20000 and still get no dial tone. What is the correct method for cabling? LAN port to WAN port on RTP300 or LAN to LAN? I've seen conflicting information on this topic. Right now, vonage is pissing me off. lol. I've been trying to configure this for over a week and getting no where.

Posts: 4694 · Vonage Forum **MVM** Joined: Aug 30, 2005 Posts: 4694

The normal way is main router LAN to RTP300 WAN. The trick of wiring to the RTP LAN with another cable from RTP LAN to RTP WAN is sometimes used to get a couple of extra LAN ports (the ones on the RTP) on the same subnet as devices plugged directly into the main router.

Have you disabled DHCP on the RTP300? If not, you should.

Posts: 5 · New Forum Member Joined: Aug 27, 2008 Posts: 5

DHCP, NAT, and Firewall are disabled on the RTP300. So is block anonymous internet requests. My 831 is my DHCP, NAT, Firewall for the whole network.

Posts: 39 · Vonage Forum Junior Joined: May 22, 2007 Posts: 39

OK it looks like you are overthinking this problem(Disclaimer: Used to work for Vonage). To answer your questions......

Cabling.

You should connect the WAN of the RTP300 to the LAN of the Cisco. Nothing else will work.

Once you have that make sure it has an IP. You can use DHCP or static, whatever works for you. Disabling DHCP on the LAN or NAT or the Firewall will have absolutely zero effect on the device receiving an IP from the Cisco and ultimately getting a dialtone. These will only affect devices on the LAN of the RTP300

If you have confirmed that the RTP300 has a Valid IP from the Cisco, and you still have no dial tone, then keep opening ports until it does. Like Steve said, ports 10k - 20k, 80, 53, 23, should do it. I may have missed one but you get the point.

Posts: 1147 · Member of the Week Joined: Feb 28, 2005 Posts: 1147

or another option if it is available is to give the port to which your rtp300 is connected, DMZ status. That way you know that nothing will impede it's communication.

some other options: disable your cisco's firewall as a temporary test. I'm wondering if it's vpn server is also a factor though I cannot think off the top of my head how it could.