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Glad to know it.

If 3CX to 3CX call still makes 2 SIP sessions over the Brekeke SIP Server, it means two RTP streams are made because each route has $rtp=true.

If you tune DialPlan rules to use ...

> For a call between the two 3CX servers, whether the calls have audio or not, there are two entries in the Active Sessions list - one for the outbound portion of the call and one for the inbound p ...

It seems there are configuration issues.
Does the BSS have a local (private) IP address?
Is the BSS located behind a NAT?

If you reproduce the issue, is it shown as a single SIP session in the [ ...

It seems the log setting is not applied yet.
Did you push [Update] button after you enabled "SIP Session" log category in [Debug Logs] page?
Once you applied the log setting, make a test ...

Please find sv.xxxx.log such as sv.240321.log not session.xxxx.log.
The session.xxx.log is kind of CDR and sv.xxxx.log is a detailed log which can include SIP packets.

You need to reproduce the issue after "SIP Session" log category is enabled.

You can find a session in the log with timestamp, From-URI and To-URI.
Check "rulename" to see it is expected rule names, and
"mode:RTPrelay" to see it is on or off.

Is the upstream service provider involved with this no audio issue?
This is because you have "$addr=upstream-service-provider-ip" in the rule "3CX-A: Inbound".

For having a det ...

If possible can you paste DialPlan rules which caused the no-audio call?
They will be two rules. 3CX-B outbound and 3CX-A inbound.

You can analyze RTP packets with Wireshark.
First, capture packets when you make a call from one 3CX to another 3CX, and say something even if there is no audio.
Second, at Wireshark, go to [Telepho ...

Does the BSS have more than one public IP address?

If you capture SIP packets when you make a call from one 3CX to another 3CX though the SIP Server, which IP address does SDP point?
Is it the BSS ...

How about this?
=============
[Matching Patterns]
$request = ^INVITE
$registered = false
To = sip:(8888)@
$getdisplayname(From) = GGGxx(.+)

[Deploy Patterns]
To = sip:%1@10.10.10.10
From/di ...

If it is a dialed number, you don't have to use a displayname.
==============
[Matching Patterns]
$request = ^INVITE
$addr = ^192\.168\.
To = sip:50\*(.+)@

[Deploy Patterns]
To = sip:150\*%1 ...

Can you try the DialPlan rule like this?
========================
[Matching Patterns]
$request = ^INVITE
$registered = false
To = sip:(8888)@
$getdisplayname(From) = GGGxx
...

John, you are right.

In DialPlan method parameter, there is no data types such as Boolean and Integer. So the true should be written as "true".

If you are familiar with Java, you can d ...

Use $not
https://docs.brekeke.com/sip/not

[Matching Patterns]
$request = ^INVITE
$registered("UserName") = true
$addr = ^PBX_IP-Address$
To = sip:(.+)@
$not($alias.lookup ...

Are these 3 SIP entities on the same local network?
Are they behind a NAT?
Can both 3CX servers send ping packet each other directly?

Refer to "3.4 Set SIP-INFO parameter" in the page below might help you.
https://docs.brekeke.com/interop/jerons-nurse-call-system-provider-790-pbx

> .{10,10} portion - Match any character, at least 10 times, but no more than 10 times. Correct?

Yes. So it can be .{10}

> But what about the '?'? I can't find any reference to that in the ...

> $registered("registered-name") = true
> $addr = ^3CX-PBX-IP-Address$

It can be written as the following.
$regAddr("registered-name") = ^(.+):
$add ...

Who put a prepended 6 digit number? Is it a calling user? or Dial Plan?
Is a caller ID paired with a unique 6 digit number?

How about adding a new rule for 911 prior to the current rules?

[Matching Patterns]
$request = ^INVITE
To = sip:911@

[Deploy Patterns]
To = sip:911@<carrier_ip>

If you want to check whether the caller ID is registered or not, you can define $registered like this.

$registered(From) = true

So you don't have to write "registered-name" for all $ ...

Hi

> $registered("registered-name") = true

Is "registered-name" always the same?
Is it the same as From-URI's caller ID?

> that is being used for the call in thi ...

Hi John,
The first rule should be like this.
[Matching Patterns]
$request = ^INVITE
$registered("3cx_registration") = true
$addr = ^ip-address_of_3cx_server$
To = sip:614491@

sip:61 ...