document: STEM : Secure Telephony Enabled Middlebox Dynamic applications , including IP telephony , have not seen wide acceptance within enterprises because of problems caused by the existing network infrastructure . Static elements , including firewalls and network address translation devices , are not capable of allowing dynamic applications to operate properly . The Secure Telephony Enabled Middlebox -LRB- STEM -RRB- architecture is an enhancement of the existing network design to remove the issues surrounding static devices . The architecture incorporates an improved firewall that can interpret and utilize information in the application layer of packets to ensure proper functionality . In addition to allowing dynamic applications to function normally , the STEM architecture also incorporates several detection and response mechanisms for well-known network-based vulnerabilities . This article describes the key components of the architecture with respect to the SIP protocol
doc_bio_tags: B O B I I I B I O O B I O O O O O O O O O O O O O O O B I O O O O O B O B I I I O O O O O O B I O O O O O B I I I O B O O O O O O O O B I O O O O O B I O O O O O O O O O O O O O O O B I O O O O O O O O O O O B I O O O O O B O O O O O O B I O O O O O O O O O O O O O O O O O O B I
extractive_keyphrases: secure telephony enabled middlebox stem ip telephony network infrastructure firewalls network address translation devices dynamic applications network design static devices application layer response mechanisms sip protocol
abstractive_keyphrases: stem architecture detection mechanisms network-based vulnerabilities