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Joined: Nov 2013
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Comlink Offline OP
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This will be long but detailed.

Samsung 7400 running V4.53c (Yes it is old software but its been running since 2007 flawlessly) with a MGI64. SIP Trunks and mostly IP phones. Public Static IP address going to MP & MGI. Dedicated network to the phone system so just voice traffic. DSL modem has been replace twice due to some network issues but connect is stable. Something I noticed today looking at the WAN connection and modem setup, it is using PPPoE vs Static credentials but not sure if that means anything but it is different than the original connection. Problem has been going on for about 6 months and progressively getting worse.

Issue #1: Extension attached to Station Group 5000 rings with anything from 2 digits and greater displayed in the LCD. When answered there is nothing there and the call will last exactly 36 seconds and then drop. A minute later it will start again. When watching connection status you can see a MGI channel (3801-3864, it will work its way through the channels sequentially) connected to a SIP Trunk (8501-8510, starting at 8510 and working its way down) ringing the extension. If I remove the extension from the VG the ringing destination will be the 1st Analog Station port or the SVMi. If the call is not answered additional MGI channels will grab additional SIP Trunks until all trunks are tied up. SIP Server under Carrier options DOES NOT need to be enable for this to happen.

What I've done: I master cleared the system and only changed the IP address' in the MP & MGI. I also entered the SIP Trunk registration details, connected to the SIP carrier made a test call, and then disable service. Left the system at the default number plan. As soon as the an extension was entered into SG 5000 the process started again. Removed the extension for the SG and now it just rings the Analog Station or VM.

Issue #2: Throughout the day when dialing out after the number has been dialed display show's CO HUNG UP. Disabling the SIP Server or rebooting the DSL modem will clear it for a bit. (This could and probably is a byproduct to issue 1)

Thoughts, advice or Guidance will be appreciated

Last edited by Comlink; 09/24/18 04:57 AM.
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This is caused by someone doing a port scan seeing you have UDP port 5060 (SIP Port) forwarded and then trying all the known asterix/trixbox hacks to do toll fraud.

Try turning on DID error Tone in MMC210.
This will stop the calls ringing.

Better option is to firmware upgrade as the newer versions (>4.7 from memory) have builtin security updates to stop this behavior.

Alternatively you can restrict the UDP 5060 in the router to only accept connections from your sip provider IP address's. Most DSL routers can't do more than 1 ip address (or a range if you're lucky) so this may not be an option.


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Comlink Offline OP
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Thanks I will give it a try in the morning and give an update.

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Looks like that took care of it at least for the day. Much appreciated.

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the First issue to fix for your sip trunks is the static WAN IP address.
Your SIP service carrier needs and IP address to send back call information, that can be routed to the phone switch.
The next thing I would do is up grade the Phone switch to at less 4.80 software.
because it can block other user from trying to use your phone switch to route calls thru it and use your sip trunks.
in the CID routing table you can block any incoming call that dose not match a 7 or 10 digit format.
the FCC is calling for all Carriers to do this in October where only 10 digits will be passed.
to help stop some of the scamming of numbers.

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Comlink Offline OP
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Has anyone restricted UDP 5060 traffic to a specific carriers IP on a Zyxel PK5001Z?


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