I found that the official firmware for goip -1 (http://dbltek.com/update/GHSFVT-1.1-67-5.pkg) contains a link to a porn site
the link is in the file /usr/etc/syscfg.default (SIP_RC4_KEY=“etoall.net”)
in the web interface you can find this link in the section: Advance VoIP - Signaling Encryption - RC4 - RC4 Encryption Key
I do not know how this link is used by hardware and software
maybe this is just a joke from Chinese manufacturers
What does this have to do with FreePBX?
I do not know of other places where it can be useful to someone
I, like many other users, use freepbx and goip
If I were you and if you can, if that site is in fact a porn site embedded in their code, I would steer clear of that provider and their equipment.
I certainly feel that this post was appropriate for this forum as it relates to a voip service that other FreePBX or other users, might be using. Or should every post be prefaced with, I use FreePBX and this might be of interest to others using GOIP, Bill?
I don’t care how you preface your posts. I asked what it has to do with FreePBX and I got my answer.
You could try calling 1-702-224-2888 and ask for Jin Qi, I’m sure he will have an explanation 
The setting would seem to tell you what it’s used for, and not as a “link” at all–it would appear to be exactly what it says, which is an encryption key. Why it would default to that, I have no idea, but it seems pretty clear what function that text is serving in the phone.
But I likewise question why random facts about random phones are appropriate to share here.
Backdoors in Chinese firmware is not new, pretty well ubiquitous now, it might look like a chinese porn site to you, but in fact is in Las Vegas to avoid geoip blocks , these guys are very clever (better than you or I) what the hardware gets, or more impotently, is given, is unlikely what you would get with curl or a web browser.
Five years ago they would be rooted in a Beijing university. They learn quicker than us
i would trust a mikrotik quicker but even they are made in China 
by default this is actually used as the encryption key
but I think it is easy for any programmer to write code that would access this file and this link
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