My client is looking to add Paging feature into their Enterprise Skype for Business systems. How much would it roughly cost to implement this as a bespoke feature

Hi there, 

My client is looking to add Paging feature into their Enterprise Skype for Business systems. How much roughly would it cost to implement this as a bespoke feature? 

Kindly send your comment to me at email: rong.jing -at- bt.com. 

Thanks,

Jing Rong