Currently we are setup on NETVANTA 7100 with PRI handoff, Is it difficult to change setting to SIP? We are getting fiber and they provisioned to SIP by mistake and I don't want to cancel and order circuit again.
Not difficult. Build a new voice trunk type SIP, then apply the same voice grouped trunk that you're using for the PRI. Either shut down the PRI interface or increase the cost of the routes on it to force outbound calls over SIP.