Avaya Communication Manager Administrator's Manual page 1741

SIP - Session Initiation Protocol
SIP is the Session Initiation Protocol, an endpoint-oriented messaging standard defined by the IETF. SIP
"trunking" functionality will allow any of the Linux-based media servers (S8300, S8500 or S8700)
running Avaya Communication Manager 2.0 to function as a POTS gateway between legacy endpoints
(analog or DCP stations and trunks) and SIP-enabled endpoints, such as the Avaya 4602 IP Telephone
and Avaya IP Softphone Release 5. The latter will include IM/presence client software, a SIP application.
SIP additions to Avaya Communication Manager running on S8300, S8500 or S8700 media servers are:
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SIP trunk support, which allows the enterprise to connect to a SIP service provider. The trunk
support is fully compliant with all SIP standards (initially compliant to all SIPPING defined
features) for any station, whether it is a SIP, H.323, DCP or analog phone.
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SIP station support (for a SIP phone via a SIP trunk), which allows any fully compliant SIP phone
to interoperate with Avaya telephones. This means any SIP phone can:
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Dial and be dialed as an extension in the enterprise dial plan.
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Participate in transfers, hunt groups, etc.
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Access X-mobility features via dial-pad sequences or preprogrammed soft buttons.
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Support for complete call detail records for all calls, if desired.
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Complete control of access to external trunks from any phone. Note that a firewall typically
would be required to control access to SIP trunks from SIP endpoints outside the enterprise.
SBS — Separation of Bearer and Signaling
Using SBS trunks for signaling helps reduce the number of private leased lines needed.. SBS trunks
support QSIG private network signaling (regardless of dial-plan length) over a low-cost, IP-based
network, while continuing to transmit high-quality voice (bearer) calls over the PSTN.
Tie
Tie trunks connect a server or switch to a central office or to another server/switch in a private network.
These trunks transmit dialed digits with both outgoing and incoming calls. Thus, incoming calls over a tie
trunk can be routed directly to the extension the caller dialed. Tie trunks are frequently used in private
networks; in addition, use tie trunks when you want a two-way trunk group with the convenience of direct
inward dialing for incoming calls.
Tie trunks that connect private network servers or switches are "universal." This means that the trunks
can be administered with a variety of translation encodes. The originating server/switch can recognize
any start dial signal (precise dial tone, wink start, or delay dial) that the terminating switch sends. If the
originating server/switch does not receive one of these start dial signals, it can be administered to send
digits after an administered interval. (This time-out interval is the amount of time that the originating
server waits before sending digits.)
Administrator's Guide for Avaya Communication Manager
November 2003
Feature Reference
Trunks and trunk groups
1741