Specifications

DNS Support.................................................................................................................................................... 26
Firewall Configuration for SIP Trunking............................................................................................................26
Call Recording...................................................................................................................................................... 27
Call recording vs. Local streaming................................................................................................................... 27
Indirect Call Recording.................................................................................................................................... 27
Additional Application Requirements....................................................................................................................28
Unified Communicator Advanced (UCA) v4.0+................................................................................................28
Mitel Contact Center........................................................................................................................................ 28
Web Proxy....................................................................................................................................................... 29
Special consideration for MCA through Web Proxy...............................................................................29
Remote Management Service......................................................................................................................... 29
Additional Security Considerations....................................................................................................................... 30
SIP Security..................................................................................................................................................... 30
Traffic Shaping...................................................................................................................................................... 31
Overview.......................................................................................................................................................... 31
Technical Details.............................................................................................................................................. 31
Clustering.............................................................................................................................................................. 33
Overview......................................................................................................................................................... 33
Cluster Zones................................................................................................................................................. 33
Node Weighting.............................................................................................................................................. 34
Additional Considerations............................................................................................................................... 35
Firewall Configuration for Clustering............................................................................................................... 35
Advanced Options................................................................................................................................................ 36
Resiliency........................................................................................................................................................ 36
IP Translations................................................................................................................................................. 36
Streaming Addresses....................................................................................................................................... 37
DMZ Deployment Profile........................................................................................................................37
Gateway Deployment Profile..................................................................................................................37
RTP Frame Size.............................................................................................................................................. 37
TFTP Block Size.............................................................................................................................................. 38
Set-side Codec................................................................................................................................................ 38
SRTP Port Range............................................................................................................................................ 38
DSCP............................................................................................................................................................... 38
Sizing Your Installation.......................................................................................................................................... 40
Determining Line Size for Large Sites............................................................................................................. 40
Step One: Determine Call Rate..............................................................................................................40
Step Two: Determine Service Rate........................................................................................................40
Step Three: Determine Grade of Service...............................................................................................40
Step Four: Erlang-B Calculator..............................................................................................................41
Determine Call Equivalents............................................................................................................................. 41
Determine Bandwidth Requirements.............................................................................................................. 41
G.711 Calculation...................................................................................................................................42
G.729a Calculation.................................................................................................................................42
Video Calculation...................................................................................................................................43
Fax Calculation.......................................................................................................................................44
Call Recording Calculation.....................................................................................................................44
Example Bandwidth Calculation.............................................................................................................44
Hardware Selection......................................................................................................................................... 45
Performance Characteristics and Limits..........................................................................................................45
Physical Hardware.................................................................................................................................45
VMWare Virtual Hardware......................................................................................................................46
Web Proxy and Remote Management Service Requirements........................................................................46
UCA and MCA Requirements......................................................................................................................... 46
Mitel Contact Center Softphone Requirements...............................................................................................47
Virtual MBG Considerations.................................................................................................................................. 49