Hi Michael, The SIP client is an iOS app behind a NAT64 network interfacing to Freeswitch which is on an IPV4 network. In order for the 200 from FS to be properly acknowledged, the client needs to send the ACK to the host in the Contact field of the 200. However, if the Contact of the 200 contains the IPV4 address of FS, the client isn't able to send the ACK to the IPV4 address from the NAT64 network. So we're hoping that we can get FS to send its FQDN in the Contact field of the 200. Any suggestions appreciated. Thanks! ---------- Forwarded message ----------

From: Michael Jerris <mike@jerris.com> To: FreeSWITCH Users Help <freeswitch-users@lists.freeswitch.org> Cc: Bcc: Date: Mon, 9 Apr 2018 12:17:21 -0400 Subject: Re: [Freeswitch-users] How to get 200 Contact to use FQDN instead of IP why would you want to do this?

On Apr 9, 2018, at 12:33 AM, E Chu <freeswitch-users@enlai.net> wrote:

Hi all,

Does anyone know how I can get FS to respond with a FQDN instead of an IP address in the contact field of the 200?

The domain is set to FQDN in vars.xml:

[hostnames and IPs changed for public list privacy]

<X-PRE-PROCESS cmd=“set” data="domain=fs-dev1.sipserver.com"/>

i.e. but this is what FS is sending in the 200:

Contact: <sip:123123123@1.2.3.4:5060;transport=tcp>

I’d like it to be:

Contact: <sip:123123123@fs-dev1.sipserver.com:5060;transport=tcp>

This is the full 200 response from FS:

SIP/2.0 200 OK Via: SIP/2.0/TCP 192.168.0.1:52631 ;rport=42810;branch=z9hG4bKPjwPkMUAMcou1XPnDrrWJH9GDwdlaPKXCF;alias;received=2.3.4.5 From: "1020" <sip:1020@fs-dev1.sipserver.com

...

;tag=h9ydSS-jO2dQ7xT8yxpVcLu-appl6Xtl To: <sip:123123123@fs-dev1.sipserver.com>;tag=vXtN8yZgtHy0B Call-ID: Y3tWlOhNz3f9bt-uHO-LjFjh2RQwQh9l CSeq: 13167 INVITE Contact: <sip:123123123@1.2.3.4:5060;transport=tcp> //HOW TO GET THIS TO USE FQDN User-Agent: FreeSWITCH-mod_sofia/1.6.16~64bit Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY, PUBLISH, SUBSCRIBE Require: timer Supported: timer, path, replaces Allow-Events: talk, hold, conference, presence, as-feature-event, dialog, line-seize, call-info, sla, include-session-description, presence.winfo, message-summary, refer Session-Expires: 120;refresher=uac Content-Type: application/sdp Content-Disposition: session Content-Length: 248 Remote-Party-ID: “123123123" <sip:123123123@fs-dev1.sipserver.com ;party=calling;privacy=off;screen=no

v=0 o=FreeSWITCH 1522636701 1522636702 IN IP4 1.2.3.4 s=FreeSWITCH c=IN IP4 1.2.3.4 t=0 0 m=audio 18966 RTP/AVP 0 96 a=rtpmap:0 PCMU/8000 a=rtpmap:96 telephone-event/8000 a=fmtp:96 0-16 a=ptime:20 a=rtcp:18967 IN IP4 1.2.3.4

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