Contact US

Log In

Come Join Us!

Are you a
Computer / IT professional?
Join Tek-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Tek-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

BCM50 SIP Trunks all in use

BCM50 SIP Trunks all in use

BCM50 SIP Trunks all in use

It only happens occasionally but it generates an alarm saying all keycoded SIP Trunks in use. This appears to be due to flooding by hackers directly trying to access the BCM on the SIP trunks. I've seen this on other systems, but generally there is a setting that makes it so that only the account registered on the system can actually call into the phone system and are not able to call the phone system directly by the IP address. Is there such a provision or setting on the BCM or is there a work around to not being bombarded by hackers preventing your legitimate calls from getting through?

RE: BCM50 SIP Trunks all in use

Make sure to disable any SIP or ALG settings and do NOT forward any ports for SIP such as 5060.

These are the only ports I have forwarded on my router and both SIP Trunks and IP Sets work fine:
UDP 7000-7002
UDP 28000-28255
UDP 51000-51200


Toronto, Canada

Add me to LinkedIN

RE: BCM50 SIP Trunks all in use

Hi there!

So I know that the 5060 port should definitely not be forwarded, but the other series of ports, 7000-7002 I thought was for IP set registration? And, as far as UDP 28000-28255 and UDP 51000-51200 I haven't looked them up to see if they deal with SIP trunking, but the SIP trunking works currently without any of these ports forwarded? The only thing I've found is that there seems to be some issue with calls being missed at times and not getting into the office. I'm going to check on the SIP and ALG settings just to be sure, but I'm pretty sure they have been turned off previously.

RE: BCM50 SIP Trunks all in use

As a follow-up to this: I just received a complaint from an end user that they were getting phone calls on their off premise IP phone that indicate extension 068? When answered, there is no audio heard. I suspect it's a hacker call, but is there a way to prevent this type of intrusion? As mentioned on my initial post, I know on the newer systems, you can specify to only accept traffic from the SIP provider address, but is this possible on either the BCM or the IP phone? I'm not sure at this point if the calls are going through the BCM or just direct to the off-premise SIP phone?

RE: BCM50 SIP Trunks all in use

These sort of preventative measures are done with your firewall. Only allow SIP traffic from your SIP trunk provider.


Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Tek-Tips Forums free from inappropriate posts.
The Tek-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Tek-Tips forums is a member-only feature.

Click Here to join Tek-Tips and talk with other members! Already a Member? Login

Close Box

Join Tek-Tips® Today!

Join your peers on the Internet's largest technical computer professional community.
It's easy to join and it's free.

Here's Why Members Love Tek-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close