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Provides voice compression channels - Used for VoIP calls Up to 32 channels - For 5.0 or lower Provides 4 initial channels with additional channels being enabled by licenses (see accessory link below) Provides 4 RJ45 ports. For 6.0 or higher - Provides all 32 VCM channels with 12 IP Telephony endpoints active; additional IP telephones can be added via license activation - Can be fitted with an IP500 daughter card that uses these ports for connections Maximum - 2 per IP500 control unit; 128 channel maximum using IP500 and or IP400 VCM cards