Configuration Guide Configuring VOIP Telephony on Deco X73-DSL
Voice over Internet Protocol (VoIP), also called IP telephony provides you with various features to enable you to make calls via the internet. Many users might not notice there is a special remember in Deco Family that also supports VOIP. With Deco X73-DSL, You can add your telephone numbers, contacts, and telephony devices to the Deco, check incoming/outgoing/forwarding calls, make emergency calls, receive voicemails, block certain calls, and more.
Here in this link, I will try to provide a whole view of the VOIP feature on Deco X73-DSL:
Deco X73-DSL VOIP Specifications
Deco X73-DSL VOIP Set-up Instruction
VOIP configuring examples for Common VOIP Providers in Australia(like TPG/ Exetel/ iinet) 
General Troubleshooting Guide:
1. Fail to register the VOIP service
- Confirm with the VOIP provider all your VOIP configuring information, such as Phone number/Authentication ID, username/password, and Registrar address.
*As for the Phone number/Authentication ID, normally they are 6 numbers provided by your ISP, not the VOIP phone number.
If your VOIP service provider is Insysco, when registering VoIP, Insysco actually uses username/authentication ID to register, instead of using Phone number like in most cases. Therefore, the phone number field needs to be filled in with an authentication ID in order to successfully register for the VOIP service.
*As for the Registrar address, please make sure you have put the whole address, such as sip.act.iinet.net.au(don't miss the last .au)
- Contact us with screenshots of the current VOIP settings.
2. Can’t receive incoming calls while outgoing calls work normally, especially under Exetel, Mate, and Internode services.
Please install the beta firmware here:
Deco X73-DSL 1.0.5 build 20221209
>>How to update the firmware via web UI
Note:
This firmware is a beta version, be sure you have read the Terms and Conditions for TP-Link Beta Firmware before proceeding!
Please feel free to comment below with details if you are experiencing any VOIP issues on Deco X73-DSL.
Hi there,
I've only just discovered these forums so i thought I'd contribute my experience with setting up VOIP with iiNet.
After days of scratching my head as to why the standard registrar DNS address wasn't working, I remembered seeing an ancient thread on Whirlpool which specified using the actual IP address rather than the DNS address as a last resort ..
Using the IP address is the only way I could get VOIP to connect using the X73-DSL..
Cheers
Adz_P
Hi @DBird,
Not sure how much I can assist you here ..
- Using the standard SIP configuaration ..
In the DECO app, click the MORE icon at the bottom .. select TELEPHONY, then select TELEPHONE NUMBERS, then select the + icon in the top right, under the TELEPHONY PROVIDER change it to iiTALK (VOIP) .. You'll then need to enter your phone number and the appropriate password [which i think is different to your normal iiNet password from memory, you should have received an email regarding your phone number and the password].. Then under the REGISTRAR ADDRESS it's a matter of selecting the correct state you're living in, you'll then need to select the same options for the SIP PROXY and OUTBOUND PROXY in the advanced section at the bottom of that page. .
- If however you need to use the IP numbers I listed above then you'll need to select OTHER as the VOIP provider and then manually enter the information on the following screen.. [I've just hashed the number below as we don't have VOIP now.. iiNet actually stuffed up our migration from FTTN to FTTP and forgot to transfer the phone number across, no great loss in my household].
I had to use this method with our old FTTN settings as the other one just wouldn't work. I don't believe I had anything in the "Authentication ID" field on the screenshots below, but I can't be 100% certain.
I wish you good luck!