While I won't be able to help you with your specific IP phone because I've never used it and can't find any emulators, after purchasing a Freephoneline VoIP unlock key, you can find your SIP Password after logging in at
https://www.freephoneline.ca/showSipSettings. Double check to ensure you've entered in your SIP password correctly without any additional spaces before or after it. The error message you're hearing is likely generated by FPL because the SIP password and/or username you've entered isn't correct. If you've ported in a phone number into FPL, your original SIP credentials will have changed (in particular, check your SIP Username).
SIP configuration settings (please make note of the registration and failed registration retry interval timers of 3600 seconds and 120 seconds, respectively) can be found at
https://support.freephoneline.ca/hc/en- ... redentials.
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Other important information to take note of is listed below.
A. If your IP Phone makes more than 5 registration attempts in 5 minutes (this is why the registration interval is important),
you may end up being temporarily IP banned by the specific FPL server the ATA was sending
registration requests to (each time you reboot the IP Phone, it's attempting to register with FPL). If you're temporarily IP banned, you could then try switching Proxy to a different FPL server than the one you were previously using (voip.freephoneline.ca, voip2.freephoneline.ca, or voip4.freephoneline.ca:6060), unless you need to use voip4.freephoneline.ca:6060 because you have SIP ALG forced on in your router. The purpose of
voip4.freephoneline.ca:6060 is to circumvent SIP ALG features in routers.
https://community.freepbx.org/t/trunk-s ... ca/22479/8
"As May 2013, our servers will rate limit REGISTER requests to a maximum of 10 requests per 5 minutes. Each authentication round usually consumes 2 requests (digest auth), so it is a fair number given our guidelines. Also, it does not affect INVITES (which are also authenticated)…
This rate limit is applied per IP address as our service is tailored to residential Canadian users (ADSL/Cable)."
B. If the IP Phone loses registration for any reason, incoming calls won't work on it. Note that only one registration per FPL account is allowed at any time. When there are multiple devices/softphones using the same account, only the most recent registration is valid. The previous device will lose registration. This is especially important to consider if someone else is using your SIP credentials (username and password) that are found after logging in at
https://www.freephoneline.ca/showSipSettings (or if you're trying to register your FPL account with a smartphone SIP app or with another device). Registration is required for incoming calls. It is not required for outgoing calls. If you simply want to make outgoing calls using your FPL number, configure, but don't register the account, on the SIP app being used. This is also important to consider if you're using Freephoneline's desktop application (don't have it running while using your ATA with the same FPL account). Additionally, keep in mind that if someone else is also attempting to register the same SIP credentials on another device where you live, too many registration attempts can result in a temporary IP ban. Always check registration status in the IP Phone and also your SIP status after logging in at
https://www.freephoneline.ca/showSipSettings. If you see a device listed under SIP User Agent that you don't recognize, you've either been hacked or someone else is using your Freephoneline SIP username and SIP Password.
Typically, for VoIP SIP services, especially for freephoneline, you want
1) a router that does not have a full cone NAT,
Visit
https://www.think-like-a-computer.com/2 ... es-of-nat/.
Mango from the Obitalk.com forums writes,
“Use a restricted cone NAT router, and do not use port forwarding or DMZ. Restricted cone NAT will only permit
inbound traffic from the service provider you're registered to. If you have a full cone NAT router, it will allow traffic
from any source. This is probably not what you intend.
If you have a Windows computer, you can test your router using the utility here:
http://www.dslreports.com/forum/remark,22292023. To run it, use stun stun.ekiga.net from a command prompt.”
Essentially, you download the stun-test.zip file; extract the stun.exe file from within the zip file to an easily
accessible location; use an elevated command prompt (visit
http://www.thewindowsclub.com/how-to-ru ... inistrator); change directory (cd) to the
directory or location where you extracted stun.exe (visit
http://www.digitalcitizen.life/command- ... c-commands); and type “stun stun.ekiga.net” without
the quotation marks followed by the enter/return button on your keyboard.
Asus routers, at the time of this writing, produce port restricted cone NAT routers, for example and are fine,
provided you’re using one with Asuswrt-Merlin, third party firmware installed.
2) a router that lets you disable SIP ALG if it's buggy,
To understand why SIP ALG often causes horrible problems, please visit
http://www.voip-info.org/wiki/view/Routers+SIP+ALG (scroll down to the section on SIP ALG problems).
If you're dealing with a modem/router combo issued by an ISP or a router with SIP ALG forced on, you may have
to use voip4.freephoneline.ca:6060 for the Proxy Server. The purpose of voip4.freephoneline.ca:6060 is to circumvent
faulty SIP ALG features in routers.