A method includes receiving a signaling protocol message associated with a voice over Internet Protocol (VoIP) call. The method includes identifying a From value of the signaling protocol message. The From value includes at least one symbol. The method includes converting each symbol of the From value to a corresponding American Standard Code for Information Exchange (ASCII) decimal value. A To value of the at least one signaling protocol message is identified. The To value includes at least one symbol. The method includes converting each symbol of the To value to a corresponding ASCII decimal value. The ASCII decimal value of the From value is compared to the ASCII decimal value of the To value to determine a larger integer and a smaller integer. The method includes concatenating the larger integer and the smaller integer to form a remote service identifier based on a predetermined sequence.