MicroSIP softphone application for Windows

[Liptonbrisk]

MicroSIP is a softphone application for Windows (and Linux, macOS, and BSD when using WIneHQ). Due to the Freephoneline desktop application being discontinued on June 3, 2025, VoIP unlock key users may want to try MicroSIP. At least MicroSIP is free and open source.

https://www.microsip.org/

The following settings work for me:

1. Select the dropdown menu arrow on the top right, and select "Add Account".

2. Account name can be whatever you want. "Freephoneline" seems like a reasonable choice.

3. For SIP Server, enter "voip4.freephoneline.ca:6060" without the quotation marks. voip4.freephoneline.ca:6060 may help to circumvent potential SIP ALG issues in routers. I would just prefer avoiding troubleshooting issues related to SIP ALG, but yes, you can use voip.freephoneline.ca or voip2.freephoneline.ca if you wish.

4. Username is your Freephoneline (FPL) SIP Username found after logging in at https://www.freephoneline.ca/showSipSettings.

5. For Domain, enter "voip4.freephoneline.ca:6060" without the quotation marks. Use whatever you entered in step 3.

6. Password is your FPL SIP Password found after logging in at https://www.freephoneline.ca/showSipSettings.

7. Enter your name for Display Name (outbound Caller ID name), and don't use "anon".

8. Set voicemail number to *98

9. Set Transport to UDP.

10.Set Register Refresh to 3600 seconds.

11. Set Keep-Alive to 20 seconds.

12. Click "Save".

13. In the upper right, click the dropdown menu arrow again, and select "Settings".

14. Disable (uncheck) Single Call Mode. Unchecking that setting is needed for 3-way calling (merging 2 existing calls together).

15. For enabled codecs, ensure G.711u and G.729 are the only enabled codecs since those are the only ones that Freephoneline supports. G.711u should be at the top. Personally, since G.729 sounds inferior, I don't even enable that codec.

16. Change Source Port to any random number you want between 30000 and 60000.
Doing so helps to avoid potential SIP Scanners and may also help to circumvent SIP ALG problems.

ex. 35553


17. Ensure Call Waiting is checked.

18. Click "Save".


Refer to https://support.freephoneline.ca/hc/art ... redentials

Good luck!

[LoDown]

MicroSIP is a softphone application for Windows (and Linux, macOS, and BSD when using WIneHQ). Due to the Freephoneline desktop application being discontinued on June 3, 2025, VoIP unlock key users may want to try MicroSIP. At least MicroSIP is free and open source.

https://www.microsip.org/

If this is used, do incoming calls ring on both the home "freephoneline phone" and on this App?

If a call is made via this App, and the home "freephoneline phone" tries to make a call at the same time, will the line be "busy" or ?

[Liptonbrisk]

If this is used, do incoming calls ring on both the home "freephoneline phone" and on this App?

Not when the same Freephoneline proxy server is used


1. SIP client registration is required for incoming calls, but not for outgoing ones (however, an outbound call may drop after 15 minutes without registration). A single ATA Line is a SIP client. A SIP app, such as MicroSIP, is another SIP client. The Freephoneline Desktop application is another SIP client.


2. The official Freephoneline policy is only one registration is permitted per VoIP unlock key.

When there are multiple devices/softphones/Lines (on an ATA) using the same FPL account, only the most recent registration is valid when the same proxy server (voip.freephoneline.ca, for example) is used. The previously registered device (or ATA line) will lose registration, and, consequently, incoming calls will not ring on it. 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, the FPL desktop app, MicroSIP, with another device, or more than one ATA line. Registration is required for incoming calls. It is not required for outgoing calls. Only one registration per FPL account is allowed at any time. A single line on an ATA is one registration. A SIP app is another.

The registration interval with Freephoneline is 3600 seconds. When the same Freephoneline proxy server is used, SIP clients will trade registration back and forth, at each registration interval. Incoming calls will only ring on the mostly recently registered device.

Attempting to circumvent this policy by using a different proxy server with each SIP client might result in account suspension in the future, but I really don't know what the future will bring. If you want to be safe, unplug the ATA while using MicroSIP for incoming calls, and if you want to use your ATA for incoming calls, disable MicroSIP.


3. Check registration status.

a. Login at https://www.freephoneline.ca/showSipSettings.
SIP Status needs to indicate "Connected". "Connected" means registered.

b. SIP User Agent reflects the SIP client that is registered at the moment when the webpage was loaded.

c. Login to your SPA2102.
i) Dial ****
ii) Then dial 110#
iii) Enter the IP address you hear into a web browser.
iv) Login to your ATA.
v) Always choose the admin login and advanced view menus (select "advanced" in the upper right).

d. Navigate to Voice tab-->Info tab-->Line (used for FPL) Status (this is not a tab)-->Registration State
Ensure your ATA Line (which is a single SIP client) is registered. This is always important to check if incoming calls are not working for your ATA.

If a call is made via this App, and the home "freephoneline phone" tries to make a call at the same time, will the line be "busy" or ?

Both outbound calls will work at the same time. Freephoneline has 2 channels. That means a maximum of 2 calls can be active at any time. However, since both channels will be used when two active calls exist, no further incoming or outgoing calls will work.