Third-party SIP phones register with CUCM but do not use a MAC address-based device ID. Basic and advanced third-party SIP phones offer the same telephony features. Third-party SIP advanced phones support up to eight lines and video but consume six DLUs. Third-party SIP basic phones support one line appearance and consume three DLUs.
Third-party SIP phones may be added as basic or advanced phones. Two different types of third-party SIP phones can be added to CUCM. Third-party phones have only RFC 3261 SIP Version 2 support, whereas Cisco SIP Phones have many Cisco SCCP features that have been rewritten to work in a native SIP protocol stack. Support for third-party SIP phone features varies greatly from Cisco SIP IP Phone features.
CUCM supports RFC 3261-compliant third-party SIP phones.
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