I need an someone that has experience with bulk SMS communications and PHP programming.
Theory of operation: In the event of an emergency service outage, which could mean no Internet access, an inbound SMS message is answered by a GSM modem and the PHP program. The PHP program will authenticate the message (match my cell number) and then execute the following: Retrieve a list of cell phone numbers from the SQL database, and then send each number in the database an SMS message. The outgoing SMS message will be the same message that was received inbound.
One area of concern is the number and rate of outbound SMS messages allowed over the modem at any one time. Currently I need to bulk message 350 messages in a short amount of time (approx 10 minutes). If this is not possible via GSM modem, please suggest alternatives.