Comet Labs IPTEL-S Bedienungsanleitung PDF herunterladen (Seite 22)

SIP Practical Issues

8/31/2005 Copyright - Ahlgren 2005 22

AhlTek

 SIP’s Prime competitor is H.323

 It is closed protocol providing signaling and media transport

 a ‘Walled Garden’, overly complex and fading

 That is the good news!

 Peer to Peer communication, insufficient for commercial service

 Proxy and registrar servers are required on the network side

 Firewall and NAT Transversal is problematic

 Newer firewalls will recognize and pass SIP

 SIP does not support E911 calls or CALEA – lawful call intercept

 The 3GPP SIP standards are solving some of these problems

 Session Border Controllers

 Support CALEA and NAT but defeat some of the value of SIP

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Comet Labs IPTEL-S Bedienungsanleitung Seite 22