You mentioned a BCM 400 system. As Curly had stated above, this system comes in different versions and the last one was at 4.0 which is Linux based and you need to use the BCM Element Manager tool in order to access it. The 3.7 system was accessible via the browser.
Bearing in mind that this is an old product, can you let us know what the current patching level is as the final ones for 3.7 and 4.0 are..
BCM 3.7
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PATCH ID: BCM370.200-BIOS Category: GEN done
PATCH ID: BCM00168 Category: GEN don't have the patch!
PATCH ID: BCM370.243-BRU Category: GEN done
PATCH ID: BCM370.252-RCC Category: GEN done
PATCH ID: BCM370.256-OS4 Category: GEN n/a
PATCH ID: BCM370.209-MSCSVC Category: GEN done
PATCH ID: BCM370.213-SU3 Category: GEN done
PATCH ID: BCM370.250-DSPFW Category: GEN n/a
PATCH ID: BCM370.215-VP5 Category: GEN n/a North America Day light saving hours
PATCH ID: BCM370.222-VP3 Category: LTD n/a Western Australia Day light saving hours
PATCH ID: BCM370.240-VP6 Category: LTD n/a New Zealand patch
PATCH ID: BCM370.255-VP7 Category: LTD n/a Australian Day light saving hours
PATCH ID: BCM370.194-OS2 Category: GEN done (increases disk space on the F drive)
PATCH ID: BCM370.204-CP Category: GEN done
PATCH ID: BCM370.226-VM Category: GEN unable to install
PATCH ID: PreCheck_Tool Category: GEN
PATCH ID: BCM370.237-UM3 Category: GEN done
PATCH ID: BCM370.245-UTPS-SRG Category: GEN unable to install
PATCH ID: BCM370.248-FEPS Category: GEN done
PATCH ID: BCM370.212-QOS Category: GEN done
PATCH ID: BCM370.227-WANDVR Category: GEN n/a
PATCH ID: Patch_Wizard2.5 Category: GEN
PATCH ID: BCM370.249-CORE Category: GEN done
BCM 4.0
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PATCH ID: BCM.R400.SU.System.034-201206 Category: GEN
PATCH ID: BCM.R400.SU.Desktop.020-201203 Category: GEN
PATCH ID: BCM.R400.340-CTE-1.5-1.0 Category: GEN
PATCH ID: BCM.R400.359-ROOTFS Category: LTD
PATCH ID: BCM.R400.140-AASpecializedTransferActivate Category: LTD
Also you need to be aware that SIP trunks were only supported between compatible PABX's. Does the IPO support H323 as the BCM could if licensed work for either protocol.
Firebird Scrambler
Nortel & Avaya Meridian 1 / Succession & BCM / Norstar Programmer
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