Trunk Setup

[Ryan Schroller]

According to 3CX this is how a register packet gets its information:

• ““To” header”: The Host Part includes the “Registrar” value set in the 3CX SIP Trunk settings.
• ““From” header”: The Host Part includes the “Registrar” value set in the 3CX SIP Trunk settings.

So does this mean that the ISP I work for is doing something incorrect? Will this never work?

Here is a TCP dump from a working FreePBX using the same trunk:

9:43:47.328183 IP (tos 0x60, ttl 64, id 45793, offset 0, flags [none], proto U$
X.84.79.22.sip > X.84.77.210.sip: [bad udp cksum 9b3c!] SIP, length: 416
REGISTER sip:X.84.79.22 SIP/2.0
Via: SIP/2.0/UDP X.84.79.22:5060;branch=z9hG4bK0c7dddb9;rport
Max-Forwards: 70
From: <sip:[email protected]>;tag=as30ee77c5
To: <sip:[email protected]>
Call-ID: [email protected]
CSeq: 102 REGISTER
Supported: replaces, timer
User-Agent: FPBX-13.0.195.13(13.23.1)
Expires: 120
Contact: <sip:[email protected]:5060>
Content-Length: 0

Here is a TCP dump from 3CX


192.168.2.11.sip > 208.84.77.210.sip: [bad udp cksum 0xe32a -> 0x4b8d!] SIP, length: 567
REGISTER sip:X.84.77.210:5060 SIP/2.0
Via: SIP/2.0/UDP X.168.2.11:5060;branch=z9hG4bK-524287-1---74b84b0722ba561f;rport
Max-Forwards: 70
Contact: <sip:[email protected]:5060;rinstance=821fd3fee80ce31b>
To: <sip:[email protected]:5060>
From: <sip:[email protected]:5060>;tag=46e09852
Call-ID: HQo0gVXnzc3zrpeyDjJBTQ..
CSeq: 1 REGISTER
Expires: 600
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REGISTER, SUBSCRIBE, NOTIFY, REFER, INFO, MESSAGE, UPDATE
Supported: replaces, timer
User-Agent: 3CXPhoneSystem 15.5.15502.6 (15502)
Content-Length: 0

As you can see, the to and from are different. 3CX has our trunk (registrar) (X.84.77.210) in the to and from. FreePBX has the PBX IP (X.84.79.22) in the to and from.

 

[cobaltit]

@Ryan Schroller

I'm not sure where you are getting your information. For sure there are default settings defined in whatever template you choose but you are free to edit those after creation. So if your company/provider wants the PBX IP instead of the registrar value then simply change the trunk settings.

 

[Ryan Schroller]

@Ryan Schroller

I'm not sure where you are getting your information. For sure there are default settings defined in whatever template you choose but you are free to edit those after creation. So if your company/provider wants the PBX IP instead of the registrar value then simply change the trunk settings.

I have tried and tried to change the register message, but have not had any luck. If you could point me in a direction or show me a file that I can modify, I would greatly appreciate it. Thanks again for your reply. It gives me faith that the community here is strong.

 

[cobaltit]

Outbound Parameters tab of the trunk configuration.

 

[YiannisH_3CX]

Hello @Ryan Schroller

Actually you cannot change the Register messages from the Outbound parameters. The outbound parameters control Invite messages. The From: and To: values will always be populated with the registrar of the trunk. This is why i would recommend using a supported provider which has been tested by 3CX and is compatible.

 

[Ryan Schroller]

Outbound Parameters tab of the trunk configuration.

I have played with the settings in there. I am guessing the one I need to change would be the to:host

Outbound Parameters tab of the trunk configuration.

This is for invite messages. I don't see it changing the Register message. I can confirm with wireshark traces.

 

[Ryan Schroller]

Hello @Ryan Schroller

Actually you cannot change the Register messages from the Outbound parameters. The outbound parameters control Invite messages. The From: and To: values will always be populated with the registrar of the trunk. This is why i would recommend using a supported provider which has been tested by 3CX and is compatible.

So you are saying a PBX built on open source coding cannot be modified like a FreePBX. It is locked down to a point where I cannot change this at all... This is very disappointing

 

[Ryan Schroller]

@Ryan Schroller

I'm not sure where you are getting your information. For sure there are default settings defined in whatever template you choose but you are free to edit those after creation. So if your company/provider wants the PBX IP instead of the registrar value then simply change the trunk settings.

Hello @Ryan Schroller

Actually you cannot change the Register messages from the Outbound parameters. The outbound parameters control Invite messages. The From: and To: values will always be populated with the registrar of the trunk. This is why i would recommend using a supported provider which has been tested by 3CX and is compatible.

 

[cobaltit]

@YiannisH_3CX

Sorry yes thanks for the correction. I meant invite, not register.