Unable to Dial Out

[Flyer78]

I am using a T.38 Fax service that is running on my print server. When the call out takes place you can see the IP's are different.I'm trying to figure out if there is a way to whitelist the IP to allow the call or what exactly is going on so that I can change what needs to be changed on the client side

Address of my 3CX server: 10.0.0.102
Address of the Fax Server: 10.0.0.3


19:41:23.818 [CM502001]: Source info: From: "IPFax"<sip:[email protected]>;tag=IPF_PORT_0001_1003<sip:[email protected]>
19:41:23.818 [CM503013]: Call(8): Incoming call rejected, caller is unknown; msg=SipReq: INVITE [email protected] tid=1005 cseq=INVITE [email protected]:5060 / 2 from(wire)
19:41:23.715 [CM500002]: Unidentified incoming call. Review INVITE and adjust source identification:
INVITE sip:[email protected] SIP/2.0
Via: SIP/2.0/UDP 10.0.0.3:5060;branch=z9hG4bK1004
Max-Forwards: 70
Contact: <sip:[email protected]:5060>
To: <sip:[email protected]>
From: "IPFax"<sip:[email protected]>;tag=IPF_PORT_0001_1003
Call-ID: [email protected]
CSeq: 1 INVITE
Allow: INVITE, ACK, BYE, CANCEL, REFER, NOTIFY
User-Agent: Net Satisfaxtion/IP_FAX-0.0.0.0
Content-Length: 0