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VIRTUAL SINGLE LINE TELEPHONE
The iDCS 100 has 14 virtual extensions. These ports have all the attributes of an
actual SLT port including call forwarding. These virtual ports can be exchanged
with real ports using the set relocation feature to provide hot desking.
VOICE MAIL – INBAND INTEGRATION
The iDCS 100 system uses DTMF tones (inband signaling) to communicate with
any compatible voice mail system. Stations can call forward to a voice mail sys-
tem. When answered, the system will send DTMF tones routing the caller directly to
the called station user’s mailbox. Keyset users can press one button to retrieve
messages from the voice mail system. A Voice Mail Transfer key permits keyset
users to easily transfer a caller directly to an individual voicemail box without navi-
gating through menus.
NOTE: Although most voice mail systems will work with the iDCS 100, the system
data has default values set to work with the Starmail Voice Processing System.
They may need to be changed if you are using another system.
VoIP
The iDCS 100 ITMC VoIP card supports up to eight voice calls over an IP network
connection using the industry standards based H.323 protocol. The ITMC cards fit
into any universal iDCS 100 card slot. The iDCS 100 supports a maximum of one
ITMC card and it must be installed in any universal slot of the main cabinet.
VoIP is transported by the iDCS 100 ITMC card utilizing the ITU standards based
H.323 protocol. This standard addresses the means of transferring voice, data,
and images through IP (Internet Protocol) networks. With VoIP certain compression
standards have also been adopted to represent each second of voice with an
amount of bandwidth. The iDCS 100 ITMC utilizes G.711, G.729A or G.723 stan-
dards voice compression codec’s. This allows for a selectable 64kbps, 8Kbps or
6.3Kbps bandwidth use when preparing voice compression for IP transport. Com-
pression is used to reduce the digitized voice into a smaller bandwidth that can be
carried in smaller packets. The ITMC H.323 gateway determines the compression
method for each call setup. There is also a certain amount of frame/packet over-
head in each compression channel. 64K of bandwidth can support 6~7 calls si-
multaneously. This can vary depending on efficiency features like Silence Sup-
pression and multiframe counts. Unlike switched networks, VoIP connections con-
sist of a sequence of numbered of data packets. Since voice conversation is usu-
ally considered “real time” these packets need to be delivered in a consistent
manner with minimal delay. This can be controlled via a Gatekeeper which tracks
and monitors voice packets. Gatekeepers are part of the H.323 standard but are
not required. The iDCS 100 ITMC is Gatekeeper compliant.
In any Ethernet environment, packet transfers are subject to delays and/or loss. If
these delays are greater than 200ms the voice quality will deteriorate. The Ethernet
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