max registrations from 1 ip address

[MC86]

Hello,

i have at a customers site a 3CX install without any problems for several years now.

we are registering with IP dect blade's to 3CX from 3 different site's without any problem (over VPN).

Since the last update (last week 18.0.8.917) we run into some issue's with the registrations with 1 of the IP dect blade's.

we can only register a maximum of 50 extentions, all other won't register. the registrations are all coming from the same ip address as the blade has only 1 ip address. we are just registering on port 5060 with sip credentials, so there is no autoprovisioning involved.

i have dived into the problem and can see with wireshark that the 3CX is only responding to the first 50 registration requests and the registration request of the 51'th extention is NOT being answered (this is from a trace on the PBX itself).

at first we looked at the DECT blade but all register packets are coming in fine to 3CX, 3CX just does not respond to those registration request. All other 50 request 3CX is handling fine.

what i did was restore a backup with version 18.0.7.312 and everything is working perfect now, proving it is a 3CX issue.But i can't update anymore now ...

i submitted a support case, to know if anything has changed but support won't help me as the blade is not supported. I don't see how supported or not supported has anything to do with this problem as i can clearly prove it is on a SIP level (traces were sent with the case).

i have also looked at the changelog but i can't find anything related to a new maximum of 50 registrations per IP address. the ip address is and was also whitelisted. There is no security setting added related to this

has anyone had this problem also recently or does anyone know something about this (limitation) ?

kind regards,

Mathias

 

[bitn2]

You need to use an SBC for your DECT base... That should solve your problem. STUN isnt supported anymore.

 

[MC86]

You need to use an SBC for your DECT base... That should solve your problem. STUN isnt supported anymore.

Hi bitn2,

we are not using any form of STUN for registering.

is STUN not supported anymore since recent?

kinds regards

 

[bitn2]

What kind of dect are you using? Is it a supported one? Why not using auto provisioning?

EDIT: yes, stun istn supported anymore

 

[MC86]

What kind of dect are you using? Is it a supported one? Why not using auto provisioning?

EDIT: yes, stun istn supported anymore

Ascom DECT Blade with 60 extentions (handsets) behind it. it is NOT supported but i don't see why this is suddenly an issue. It worked since 3/4 years, now it doesn't anymore and my question is: what has changed, and especially why ?

 

[bitn2]

Ascom DECT Blade with 60 extentions (handsets) behind it. it is NOT supported but i don't see why this is suddenly an issue. It worked since 3/4 years, now it doesn't anymore and my question is: what has changed, and especially why ?

No one can say what has changed that this system doesnt work anymore. Thats the problem with unsupported stuff. Anytime in the future it could stop working.

 

[MC86]

No one can say what has changed that this system doesnt work anymore. Thats the problem with unsupported stuff. Anytime in the future it could stop working.

but nothing had changed as stated in my first post, only 3CX did an auto update (which is disabled now), so it has to be something in the PBX.

 

[bitn2]

That is what i am saying, 3cx could habe changed something that doesnt work for you anymore. Your dect stuff is unsupported, so no one could say what is broken for you. (sorry for my english)

 

[SweetAction]

This is interesting (max 50 registrations from a single IP). The largest ATA that 3CX supports is a 48 port, which fits nicely under that 50 extension limit.

If I were you I would change the focus of the support ticket to this and ask where is the limit and how can it be changed. Ignore your DECT blade and ensure support knows you are asking about a 50 extension registration limit per IP.

I would test putting in a SBC - yes it's kinda pointless, but I wonder if this limit doesn't exist for "via" registrations.