Following the latest release, the hyperlink functionality we have been using to link agents to the telephony app and to create a new task linked to the lead they are dialling off stopped working.

I have been trying to create a new custom link within the lead layout, but I cannot get it to link to the Lead.  
Here is what I have currently:

https://eu1.salesforce.com/00T/e?Task.Subject=Call&Task.Who={!Lead.Id}&followup=1&tsk5=Call&retURL=%2F{!Lead.Id}&Task.Number_Dialled__c=&{!Lead.MobilePhone}&Task.Call_Source__c=Outbound;

window.open('https://xxxxx.xxxx.net.nz/Dialer/Phone/"&{!Lead.MobilePhone}&"','DiallerWindow','status = 1, height = 500, width = 500, resizable = 1');

When I click the custom link, a new task is created but it is not linked to the lead I came from, and the dialler piece does not work.

Help?!

 

Following the latest release, the hyperlink functionality we have been using to link agents to the telephony app and to create a new task linked to the lead they are dialling off stopped working.

I have been trying to create a new custom link within the lead layout, but I cannot get it to link to the Lead.  
Here is what I have currently:

https://eu1.salesforce.com/00T/e?Task.Subject=Call&Task.Who={!Lead.Id}&followup=1&tsk5=Call&retURL=%2F{!Lead.Id}&Task.Number_Dialled__c=&{!Lead.MobilePhone}&Task.Call_Source__c=Outbound;

window.open('https://xxxxx.xxxx.net.nz/Dialer/Phone/"&{!Lead.MobilePhone}&"','DiallerWindow','status = 1, height = 500, width = 500, resizable = 1');

When I click the custom link, a new task is created but it is not linked to the lead I came from, and the dialler piece does not work.

Help?!