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| Part Number | Description | |
| CON-ESW-4135I21 | ESSENTIAL SW Unified CallMgr 4.1 For MCS 7835-I2 | |
| CON-ESW-4145H21 | ESSENTIAL SW Unified CallMgr 4.1 For MCS 7845-H2 | |
| CON-ESW-4145I21 | ESSENTIAL SW Unified CallMgr 4.1 For MCS 7845-I2 | |
| CON-ESW-412950D1 | ESSENTIAL SW Unified CallMgr 4.1 ForDell PE 2950/2CPU | |
| CON-ESW-41380G51 | ESSENTIAL SW Unified CallMgr 4.1; HP DL380-G5 1CPU | |
| CON-ESW-4180G5D1 | ESSENTIAL SW Unified CallMgr 4.1; HP DL380-G5 2CPU | |
| CON-ESW-42320G5 | ESSENTIAL SW Unified CallMgr 4.2 For HP DL320-G5 | |
| CON-ESW-42380G51 | ESSENTIAL SW Unified CallMgr 4.2 For HP DL380-G5 1CPU | |
| CON-ESW-42G5D1 | ESSENTIAL SW Unified CallMgr 4.2 For HP DL380-G5 2CPU | |
| CON-ESW-42X36501 | ESSENTIAL SW Unified CallMgr 4.2 For IBM x3650 1CPU | |
| CON-ESW-42X50D1 | ESSENTIAL SW Unified CallMgr 4.2 For IBM x3650 2CPU | |
| CON-ESW-427825H3 | ESSENTIAL SW Unified CallMgr 4.2 For MCS 7825-H3 | |
| CON-ESW-427825I3 | ESSENTIAL SW Unified CallMgr 4.2 For MCS 7825-I3 | |
| CON-ESW-4235H21 | ESSENTIAL SW Unified CallMgr 4.2 For MCS 7835-H2 | |
| CON-ESW-4235I21 | ESSENTIAL SW Unified CallMgr 4.2 For MCS 7835-I2 | |
| CON-ESW-4245H21 | ESSENTIAL SW Unified CallMgr 4.2 For MCS 7845-H2 | |
| CON-ESW-4245I21 | ESSENTIAL SW Unified CallMgr 4.2 For MCS 7845-I2 | |
| CON-ESW-422950D1 | ESSENTIAL SW Unified CallMgr 4.2 ForDell PE 2950/2CPU | |
| CON-ESW-43320G5 | ESSENTIAL SW Unified CallMgr 4.3 For HP DL320-G5 | |
| CON-ESW-43X3250 | ESSENTIAL SW Unified CallMgr 4.3 For IBM x3250 |