Systems and methods for handling the processing of multiple SIP transactions that have been requested at substantially the same time can involve establishing a priority order for processing the SIP transactions, and then individually processing the SIP transactions based on the established priority order. One or more SIP transactions having a lower priority can be held in a SIP processing queue of a software application until the processing of SIP transactions having a higher priority has been completed. Each time that the processing of a higher priority SIP transaction is completed, the next-highest priority SIP transaction in the queue is submitted for processing. Also, where possible, two or more SIP transactions in the queue may be consolidated into a single SIP transaction.