BSS rejects the call with 603 when using $transport=TCP

[skb007]

1. Brekeke Product Name and Version:3.9.6.4

2. Java version:1.8

3. OS type and the version:RHEL 7.5

4. UA (phone), gateway or other hardware/software involved:N/A

5. Your problem: BSS rejects the inbound call with 603 when changing the transport on the UAS side. Everything works fine if I remove "$transport=TCP".

Matching Patterns

$request = ^INVITE $addr = ^4.4.4.4$ To = sip:(.+)@ From = sip:(.+)@

To = sip:%1@5.5.5.5
From = sip:%2@2.2.2.30
$b2bua = true
$rtp = false
$ifsrc = 2.2.2.29
$ifdst = 2.2.2.30
$transport=TCP

TCP is enabled on the Configuration-->SIP
STATUS-->Transport is showing TCP.
"netstat -anp | grep 5060"shows both udp and tcp for port 5060

I am getting the following error in the logs:
sipex.4: add:session.86: 12/18/18 11:20:06.472^M
session.86: Exception: 12/18/18 11:20:07.274
java.lang.NullPointerException: (depth=4)
com.brekeke.net.sip.sv.SessionStat.init (null:-1)
com.brekeke.net.sip.sv.SIPex.initSessionStat (null:-1)
com.brekeke.net.sip.sv.SIPex.runImple (null:-1)
com.brekeke.thread.ThreadCommon.run (null:-1)
^M
session.86: send response=603: SessionStat: java.lang.NullPointerException^M

[skb007]

Any help would be much appreciated.

[Mike]

What happen if you remove "$ifdst=2.2.2.30" ?