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Both H.323- and SIP-based telephones can run on the same LAN or VLAN without difficulty. You can even mix H.323 phones and SIP phones having the same model, for example, the 4620SW. However, any given telephone supports only one signaling protocol at a time. You must therefore ensure that the proper application files (the software that runs in the telephone) are sent to the appropriate telephones. For information on downloading the software to the telephones, see Choosing the Right Application File and Upgrade Script File later in this chapter.
In general, H.323 and SIP telephones use the same administration mechanisms, with the exception that H.323 phones get some telephony administration from the Avaya call server. If you intend to mix H.323 and SIP telephones on the same network, you can use common information in either DHCP or in a common script file for those settings common to both types of sets. Because settings not applicable to a given telephone set are ignored, you can send SIP-specific settings to an H.323 telephone and H.323 settings to a SIP telephone without creating problems.
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