Why is my "From" address the Private IP address, not Public IP

Asterisk Asterisk SIP
1

Asterisk 20.5.2

We are connecting our Asterisk to a Cisco PBX via SIPS trunk over the Internet. My SIP headers are showing the Private IP instead of the Public IP addresses. I want the Public IP addresses to be sent instead.

<— Transmitting SIP request (1118 bytes) to TLS:64.253.174.35:5061 —>
INVITE sip:2705@:5061 SIP/2.0
Via: SIP/2.0/TLS 54.226.54.243:5061;rport;branch=z9hG4bKPjHNVcE7EFd8N1R77tmXCuhVxaQr3FEI-K;alias
From: “Eric Dailey” sip:1000@10.90.42.4;tag=OwSilvua6NmI0lham4HF.kDRlRTzxwuO
To: sip:2705@64.253.174.35
Contact: sip:asterisk@54.226.54.243:5061;transport=TLS
Call-ID: zwYc1hQqPPCo.0AmjiK-43-WLkgqtgIu
CSeq: 15412 INVITE
Allow: OPTIONS, REGISTER, SUBSCRIBE, NOTIFY, PUBLISH, INVITE, ACK, BYE, CANCEL, UPDATE, PRACK, MESSAGE, REFER
Supported: 100rel, timer, replaces, norefersub, histinfo
Session-Expires: 1800
Min-SE: 90
Max-Forwards: 70
User-Agent: PerfectServe SBC 20.5.2
Content-Type: application/sdp
Content-Length: 430

2 
INVITE sip:2705@<Public IP of Cisco SBC>:5061 SIP/2.0
Via: SIP/2.0/TLS 54.226.54.243:5061;rport;branch=z9hG4bKPjHNVcE7EFd8N1R77tmXCuhVxaQr3FEI-K;alias
From: "Eric Dailey" <sip:1000@10.90.42.4>;tag=OwSilvua6NmI0lham4HF.kDRlRTzxwuO
To: <sip:2705@64.253.174.35>
Contact: <sip:asterisk@54.226.54.243:5061;transport=TLS>
Call-ID: zwYc1hQqPPCo.0AmjiK-43-WLkgqtgIu
CSeq: 15412 INVITE
Allow: OPTIONS, REGISTER, SUBSCRIBE, NOTIFY, PUBLISH, INVITE, ACK, BYE, CANCEL, UPDATE, PRACK, MESSAGE, REFER
Supported: 100rel, timer, replaces, norefersub, histinfo
Session-Expires: 1800
Min-SE: 90
Max-Forwards: 70
User-Agent: PerfectServe SBC 20.5.2
Content-Type: application/sdp
Content-Length:   430

But note that some of the angle brackets are meta-name markers, and some are real angle brackets!

3

This will happen if you don’t configure the signalling address, or if you configure the local networks to include the destination address.