Cisco Router-Tell which ports are currently open/VOIP??

Is their any way to tell on a Cisco router which ports are currently open?  I'm trying to figure out which ports our Siemens VOIP phones are using. Outgoing traffic is being prioritized (LLQ) on the router but all traffic (incoming) originating from the offsite phone system is not so I’d like to be able to tell which ports it’s opening on the offsite phone system router.
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

1. see the router config - if you not blocking particular ports with access lists - they all open
2. run portscan software - plenty on the web.
cmmosman1Author Commented:
I guess I wanted to see which ports are in use and not necessarily which are open, sorry.  Is their someway to tell that?
If you have NAT in the router - just enter command "show ip nat translations" and you will see all ports wich in use at the moment.

Also, it will be useful to use "show ip port-map" command to see list of port services available...
Determine the Perfect Price for Your IT Services

Do you wonder if your IT business is truly profitable or if you should raise your prices? Learn how to calculate your overhead burden with our free interactive tool and use it to determine the right price for your IT services. Download your free eBook now!

cmmosman1Author Commented:
I unfortunetly don't have the router NATed....any other ideas?

You can set up sniffer to listen on the router inside/outside interfaces, use Ethereal which is free and brilliant:
Just connect router and PC with sniffer to the same hub (not switch) and see what applications/ports in use at the moment...

Ethereal PC
if just the signalling goes trought the router than SIP uses port 5060
but if also RTP and RTCP stream goes trought the router, it is much bigger issue, because the port for the rtp stream is dinamicly asigned, and you canot predict the port for rtp.

cmmosman1Author Commented:
Since the traffic doesn't seem to be going over Cisco IOS H.323 ports 16385-3276 I just ended up matching any traffic destin to the ip addreess of the phone.  Thanks for all you help.
PAQed with points refunded (500)

Community Support Moderator

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.