connect 2 routers together using one as a SIP device

I have a network which works fine using a Juniper 5GT router.

Recently, I came into possession of a Belkin VOIP router with a VOIP account.  I'd like to know if there is a way I can continue using the Juniper as my main router, and connect the Belkin on the LAN just to be used for VOIP (single handset).

Le'ts call the Juniper ROUTER A and the Belkin ROUTER B herein.

I've connected PORT 1 from ROUTER A to PORT 1 of ROUTER B and set ROUTER B to use an IP in the same subnet i.e. A = 192.168.102.1 B = 192.168.102.253.

On any PC connected to ROUTER B I can gain internet access.  ROUTER B can see and PING ROUTER A.

Unfortunately, ROUTER B cannot ping out from itself to the www.  Therefore, the SIP device never connects.

If this isn't possible then thats cool, i'd just prefer to make use of this device and avoid buying a seperate SIP device.

Thanks for your help and ideas!!
makingithappenAsked:
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Reid PalmeiraTelecom EngineerCommented:
not sure what you mean by port 1, etc

BUT, presuming the Juniper box has its WAN connection to your ISP, you should be able to take a LAN connection from the Juniper router and connect it to the WAN side of the Belkin box. This gives the belkin a WAN IP of something like 192.168.102.X  then on the LAN side of the Belkin box, if you plug in a computer you should get an IP in a different subnet.

esenttially performing NAT twice.

now, you'll also probably need to setup some rules on the Juniper box so that the Belkin router either has the necessary signalling and RTP ports forwarded to it, or so that the WAN IP of the Belkin router (which is on the LAN side of the Juniper router) sits in a DMZ.

VoIP TCP/UDP/RTP ports will vary depending on the protocols used and provider.
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makingithappenAuthor Commented:
Hi thanks for your answer

I mean port 1 as in, both devices are 4 port routers.  The Juniper has a WAN port which runs into a run of the mill ADSL modem.

The Belkin however, is an ADSL router with 4 LAN ports (no WAN) and therein lies my difficulty in configuring.
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Reid PalmeiraTelecom EngineerCommented:
hm, if it's one of the ADSL routers with an actual ADSL input rather than an Ethernet WAN interface, I don't think it'll work. you can probably use it easily as a switch but these types of low end devices aren't really designed as four port routers, they're just simple routers with four LAN switch ports. so the static default route built into it tells the voice to go out the ADSL interface.

you could probably do the opposite though. take out the ADSL modem, use the Belkin router for the WAN and stick the juniper router on the LAN side of the Belkin, NATting that device instead.
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