- Silver, 250 points or more
I have a customer who has a cisco 828 router delivered from his ISP. Behind that router I've connected the UC520 with a global IP adress. We are supposed to use a SIP trunk ftom a ITSP on the UC520 but are not able to get it up and running. I think it may be a NAT issue since the 828 is in front of the UC520. I'm not very good with NAT at all so any suggestions on how to make it work is appreciated.
The c800 router will be able to perform the necessary Application Layer Gateway (ALG) functions necessary in this case. Check the following document for some general considerations and theory:
Technical Marketing Engineer
Cisco Systems, Inc.