Your SIP Username changes after you port and, in turn, AuthUserName needs to be updated in your ATA accordingly.
In your ATA or using Obitalk.com Expert settings, whichever method you use (don't use both), navigate to Voice Services > SP(FPL) Service >SIP Credentials > AuthUserName.
You can find your SIP username after logging in at https://www.freephoneline.ca/showSipSettings.
What brand and model router are you using?
Use this PDF guide to properly setup FPL first: http://forum.fongo.com/viewtopic.php?f= ... 805#p73839.
Then follow pages 42 to 44 if the problem persists.
Please 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).
If it’s a porting issue, it may take up to 24 hrs to resolve.