Cisco TelePresence Administrator's Manual page 504

Reference material
Title
PHP regex guidelines
Regular Expression Pocket Reference ISBN-10: 0596514271 ISBN-13: 978-
0596514273
RFC 791: Internet Protocol
RFC 1305: Network Time Protocol
RFC 2460: Internet Protocol, Version 6 (IPv6) Specification
RFC 2782: A DNS RR for specifying the location of services (DNS SRV)
RFC 2915: The Naming Authority Pointer (NAPTR) DNS Resource Record
RFC 3164: The BSD syslog Protocol
RFC 3261: SIP: Session Initiation Protocol
RFC 3263: Session Initiation Protocol (SIP): Locating SIP Servers
RFC 3326: The Reason Header Field for the Session Initiation Protocol (SIP)
RFC 3327: Session Initiation Protocol (SIP) Extension Header Field for
Registering Non-Adjacent Contacts
RFC 3489: STUN - Simple Traversal of User Datagram Protocol (UDP) Through
NATs
RFC 3550: RTP: A Transport Protocol for Real-Time Applications
RFC 3761: The E.164 to URI Dynamic Delegation Discovery System (DDDS)
Application (ENUM)
RFC 3880: Call Processing Language (CPL): A Language for User Control of
Internet Telephony Services
RFC 4028: Session Timers in the Session Initiation Protocol (SIP)
RFC 4787: Network Address Translation (NAT) Behavioral Requirements for
Unicast UDP
RFC 5245: Interactive Connectivity Establishment (ICE)
RFC 5626: Managing Client-Initiated Connections in the Session Initiation
Protocol (SIP)
RFC 5627: Obtaining and Using Globally Routable User Agent URIs (GRUUs) in
SIP
RFC 5806: Diversion Indication in SIP
Session Traversal Utilities for NAT (STUN)
Traversal Using Relays around NAT (TURN): Relay Extensions to Session
Traversal Utilities for NAT (STUN)
Cisco VCS Administrator Guide (X8.1.1)
Related documentation
Link
http://php.net/manual/en/
book.pcre.php
http://tools.ietf.org/html/rfc791
http://tools.ietf.org/html/rfc1305
http://tools.ietf.org/html/rfc2460
http://tools.ietf.org/html/rfc2782
http://tools.ietf.org/html/rfc2915
http://tools.ietf.org/html/rfc3164
http://tools.ietf.org/html/rfc3261
http://tools.ietf.org/html/rfc3263
http://tools.ietf.org/html/rfc3326
http://tools.ietf.org/html/rfc3327
http://tools.ietf.org/html/rfc3489
http://tools.ietf.org/html/rfc3550
http://tools.ietf.org/html/rfc3761
http://tools.ietf.org/html/rfc3880
http://tools.ietf.org/html/rfc4028
http://tools.ietf.org/html/rfc4787
http://tools.ietf.org/html/rfc5245
http://tools.ietf.org/html/rfc5626
http://tools.ietf.org/html/rfc5627
http://tools.ietf.org/html/rfc5806
http://tools.ietf.org/html/rfc5389
http://tools.ietf.org/html/rfc5766
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