Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

New Member

How to config two sip-trunks going through cisco 887

I have a cisco 887 ADSL router. I use it for small bussiness, and I have Siemens phone system behind it. Normal users go through to internet by NAT, but  this Siemens phone system use SIP protocol to link SIP Server in the internet, I configrate static translate. I configrate cisco 887 as blow:

no ip nat service sip udp port 5060

ip nat inside source static tcp 5060 x.x.x.x 5060 extendable

*** is phone system IP address, x.x.x.x is public IP address that ADSL vendor gave to me.

everything is ok.

One day, I need add anther Siemens phone system behind this Cisco 887. For example, using ip address, I can't configrate a translation to a same IP address + port. How can I solve it.

In anther word, this translation is necessary or not. Intead of Cisco 887, I have ever used other ADSL Router, there is no translation, but I can use Siemens phone system.

  • Small Business Routers
This widget could not be displayed.