Hello surgemorales,
as mentioned in my other reply the BootROM itself does not matter as features are either added in the SIP or UCS Software so depending on this yet unknown Software Version the advise below may be of interest to yourself.
In addition the Software Versions change over the time and someone finding this post via the search function would not know what is classed as the latest software at the time of the post.
Please check the UCS Admin Guide 4.1.0 which can be found => here <= on page 222:
Enabling Multiple Registrations
Polycom phones can have multiple registrations; each registration requires an address, or phone number. Table 7-27:
Enabling Multiple Registrations explains the registration parameters and options. The IP 321, 331, and 335 phones support a maximum of two registrations, the IP 450 phones support up to three, the IP 550 and 560 phones support up to four, and the IP 650, VVX 500 and 1500 phones and SpectraLink handsets support up to six. Up to three SoundPoint IP Expansion Modules can be added to a single host SoundPoint IP 650 phone to increase the total number of registrations to 34. The SoundStation IP 5000 and 6000 each support a single registration.
Each registration can be mapped to one or more line keys. Note that a line key can be used for only one registration. The user can select which registration to use for outgoing calls or which to use when initiating new instant message dialogs. Note that this feature is one of several features associated with Flexible Call Appearances. For definitions of all features associated with Flexible Call Appearances, see Table 7-4: Flexible Call Appearances.
Please ensure to provide some feedback if this reply has helped you so other users can profit from your experience.
Best Regards
Steffen Baier
Polycom Global Services
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If official support is required please check how to phone or open a case here
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The title Poly Employee & Community Manager is a community setting and
does not reflect my role. I am just a simple volunteer in the community like everybody else. All posts and words are my own & do not represent the views of Employer.
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Notice: This community forum is not an official Poly support resource, thus responses from Poly employees, partners, and customers alike are best-effort in attempts to share learned knowledge. If you need immediate and/or official assistance please open a service ticket through your proper support channels.
Please also ensure you always check the VoIP , Video Endpoint , Skype for Business , PSTN or RPM FAQ's
