I have a customer with 8 stores. The main store has an IPO 406 V5 with a PRI. The other 7 stores are getting VOIP hosted systems and need to communicate with the main store via 4 digit dialing. Is there a way to enhance the 406 to allow this type of dialing between all stores, and keep the current 6400 series phones? Calls need to be transferred between all stores. paging across the network would be nice, but not necessary. Transferring calls direct to someone's voice mail box needs to happen as well, again, across the network between all stores.
Looking for low cost ideas at this point. If no low cost, can I change the control module only, keep the 6400 series phones, and be able to accomplish what I need?
Can I do this if I upgrade to IP phones?
Thanks in advance.