Polycom SIP 2.2.2 manual Cfg file can be used for all phones in a deployment

Administrator’s Guide SoundPoint IP / SoundStation IP

Note	This approach takes advantage of an enhancement that was added in
	SIP2.0.1/BootROM 3.2.1 that allows for the substitution of the phone specific
	[MACADDRESS] inside configuration files. This avoids the need to create unique
	<Ethernet address>.cfg files for each phone such that the default
	000000000000.cfg file can be used for all phones in a deployment.
	If this approach is not used, then changes will need to be made to all the <Ethernet
	address>.cfg files for SoundPoint IP 300 and 500 phones or all of the <Ethernet
	address>.cfg files if it is not explicitly known which phones are SoundPoint IP 300
	and 500 phones.
	For more information, refer to “Technical Bulletin 35311: Supporting
	SoundPoint IP 300 and IP 500 Phones with SIP 2.2 and Later Releases“ at
	http://www.polycom.com/support/voice/.

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