iPECS UCM
Installation Manual Issue 1.1
14
2.2.2.6 UCM-VPCM
The UCM-VPCM (Voice Prompt & Conference Gateway Module) is the supplementary VoIP function Gateway
Module that supports voice prompt, storage, conference, trans-coding, RTP/RTCP packet security (SRTP) in
iPECS UCM System. UCM-VPCM can provide up to 256 channels (based on G.711 Codec) for all functions
above except for voice trans-coding. The maximum number of channels available for voice trans-coding may
be less than 256 channels, depending on the Codec type. Voice announcement data can be uploaded using
FTP and is stored in the CFC card. For voice conference, maximum 128 subscriber channels can be
accommodated in a conference group. The UCM-VPCM consists of CPU block, memory block, LAN switch
block, SRTP block, DSP block, MFP (Multi-Function Processing) block, Oscillators and DC/DC power block.
Voice prompt & storage
Specifications
File format: A-law / u-law PCM 8 bit (Mono)
File storage: eMMC Memory Card (32GB)
Voice conference
Max number of channels accommodated per group: Max. 128 channels
Group-specific gain control range: 0 dB ~ (-) 30 dB
Maximum capacity per Codec (Voice data length per packet)
G.711: 256 channels (20 ms), 160 channels (10 ms), 80 channels (5 ms)
G.723.1: 80 channels
G.729. A: 100 channels
G.729. E: 48 channels
Opus: 16 channels
SRTP
RFC 3711 Compliance
Session capacity: MAX. 512 sessions (RTP: 256 sessions, RTCP: 256 sessions)
Encryption algorithm
Encryption algorithm: AES-CM (Advanced Encryption Standard – Counter Mode)
HMAC Algorithm: SHA-1 (Secure Hash Algorithm 1)
Very Low Encryption/Decryption Delay (About 50us in case of G.711 20ms)
Interface specification
10/100Base-T Ethernet 1port and SIO 1 port
Others
Status LED and Reset switch
Electrical specification
Input power: +5V, DGND, FGND
Mechanical specification
Gateway Module dimension (W x L): 255 mm x 334.5 mm (Including card edge)
Gateway Module weight: 460g
Figure 2-9 UCM-VPCM
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