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SIP: Alternative Softswitch Architecture
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(RTSP).8 This leads to simple parsing and generation, particularly when done with powerful text-processing languages such as Perl. The textual encoding also simplifies debugging, allowing for manual entry and the perusing of messages. Its similarity to HTTP also allows for code reuse; existing HTTP parsers can be quickly modified for SIP usage.9 One of the biggest criticisms of H.323 is that it can result in the transmission of many unnecessary messages across the network. This causes H.323 to not scale well. That is, for a large system, the overhead associated with handling a large number of messages has a significant effect on the system performance. A more heavily loaded system will result in poorer voice quality. QoS measures do not address network traffic and call setup issues in H.323. H.323 s complexity also stems from its use of several protocol components. There is no clean separation of these components; many services require interactions between several of them. (Call forward, for example, requires components of H.450, H.225.0, and H.245.) The use of several different protocols also complicates firewall traversal. Firewalls must act as application-level proxies,10 parsing the entire message to arrive at the required fields. The operation is stateful since several messages are involved in call setup. SIP, on the other hand, uses a single request that contains all necessary information. Figure 5-5 illustrates the messages required to set up a call, assuming that the caller already knows the address of the callee. Without going into the details of the messages, it can be seen that setting up the call requires the exchange of 16 messages across the network. This number grows considerably if the two terminals are located on different LANs or are managed by the Terminal Capability Set messages. This allows the two ends to agree on the parameters to be used for the call. In the case of SIP, this information is exchanged in the Invite and 200:OK messages (see Figure 5-6). Separate messages are not required. Likewise, in H.323, separate messages are exchanged to create logical connections between the two endpoints over which the voice information is passed (using the Open Logical Channel messages). In SIP, this information is also passed in the Invite and the 200:OK message.11
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Schulzrinne, H., R. Lanphier, and A. Rao. Request for Comments (Proposed Standard) 2326: Real-time streaming protocol (RTSP). Internet Engineering Task Force, April 1998. 9 Schulzrenne, Henning, and Jonathan Rosenberg. A Comparison of SIP and H.323 for Internet Telephony. White paper available at www.cs.columbia.edu/sip/papers.html. 10 Packet-Based Multimedia Communications Systems, H.323, ITU, February 1998. 11 SIP vs. H.323, A Business Analysis. White paper from Windriver, available at www. sipcenter.com/files/Wind_River_SIP_H323.pdf.
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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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SIP: Alternative Softswitch Architecture
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Figure 5-5 Call setup process for H.323
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ARQ ACK SETUP CALL PROCEEDING ALERTING ALERTING CONNECT TERMINAL CAPABILITY SET TERMINAL CAPABILITY SET ACK TERMINAL CAPABILITY SET TERMINAL CAPABILITY SET ACK OPEN LOGICAL CHANNEL OPEN LOGICAL CHANNEL ACK OPEN LOGICAL CHANNEL OPEN LOGICAL CHANNEL ACK ARQ ACK
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Conversation
Figure 5-6 Call setup process for SIP
Calller (1) Invite (2) 180 Ringing (3) 200 OK (4) ACK
Calllee
Conversation (5) BYE (6) 200 OK
To counter this obvious weakness in H.323, procedures were added to enable H.323 to connect basic calls much quicker. This procedure is referred to as Fast Start and is illustrated in Figure 5-7. Fast Start eliminates several of the messages by requiring each side to have detailed knowledge of the parameters for the call and to have preassigned ports for communicating. This significantly limits the ability to make calls to multiple locations,
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