eceiver side and thus, the whole message needs to be retransmitted at the session- layer, according to the SIP reliability mechanism. The tests also show that the delay is lower with the unsolicited and solicited status report option set, compared to only having the solicited feedback. This is because by incorporating unsolicited feedback on top of solicited, the missing protocol data units (PDU) can be recovered faster since retransmissions of missing PDUs can be performed before polling; also the reduction in delay is greater at a higher block error rate (BLER). C 2009 by Taylor & Francis Group, LLC SIP Handbook: Services, Technologies, and Security 22.2.2.1.3 Session setup delay Handley and Jacobson [7] have shown that session setup delay and call blocking probability for a simple call setup sequence consists of the sending of the INVITE request and the 180 ringing response. Two status report trigger settings present a bound on the delay. Tgood status report trigger settings range between 0.5 and 10 S, and Tbad equal to 0.5, 2 and 4 S. Comparing both schemes, it can be seen that when the channel is good, i.e., for a low Tbad value or a high Tgood value, there is hardly any difference in performance, but as the channel gets worse, combining both unsolicited and solicited feedback options gives a lower delay and blocking probability. SIP signaling is transactional-based and generous in size. Therefore merely transport of packets over the radio interface is not sufficient. Consideration needs to be given to the delay values and the errors in the process. When passing over the error-prone wireless link plus a larger satellite propagation delay, the session establishment delay can be rather large. At the moment SIP over Satellite is not advisable. From a previous study [3], it was shown that with the presence of RLCAM, the session setup performance can be substantially improved. Also it was shown that the combination of unsolicited and solicited status report triggers gives better performance than just solicited al