Hi I have a client who wants to know if its possible to connect two IP phones and a PC to one network port
The IP Phone with PC is meant to be a one to one relationship. Here is some additional Cisco documentation that reflects the fact that Daisy Chaining IP Phones is not supported;
Daisy Chaining Cisco Unified IP Phones
Cisco does not support connecting an IP phone to another IP phone through the PC port. Each IP phone should directly connect to a switch port. If phones are connected together in a line (daisy chaining by using the PC port), the phones will not work.
Hope this helps!