I have a Deco X50 with a Smarty Sim card unlimited Data, Voice and text package. I am receiving 4G from local Mast which gives me good download and upload speed.

I have an alarm system for the house and an analogue speech dialer to inform me when the alarm is triggered. 

To overcome the problem of no landline I have purchased a Linksys Internet phone adapter VOIP. and connected to the phone and Deco X50. I have assigned it a permanent IP address on the Deco X50 I have all the green lights showing activity on the VOIP converter.

I have configured the converter to use the assigned IP address but still not making any call connections. I have written to Smarty my service provider and they are suggesting it's down to the deco/converter.

Has anyone else had this problem and how did you overcome this issue?