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Milwaukee to Madison areas
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IP Office SIP - Session Initiation Protocol Expertise
post on getting SIP certified
- Session Initiation Protocol
IP Office supports SIP, which is a signaling
protocol used for creating session oriented connections between
two or more locations in an IP network. SIP trunking is a service
offered by an ITSP (Internet Telephony Service Provider)
that permits businesses with an IP Office installed to use Voice-over-IP
(VoIP) outside the enterprise network by using the same connection
as in Internet connection or a separate connection, if desired.
A connection that provides priority for SIP traffic shared across
a WAN is needed to maintain call quality.
implemented properly, using SIP can save you money.
You can order SIP trunk channels (concurrent sessions) as you need,
where a full T1/PRI is 24/23 channels. Even with a “minimum” channel
offer for T1/PRI, you still require hardware (card) to connect the
circuit and of course, the circuit has to be delivered or a handoff
from provider equipment. Some advantages can be when a call connects
to other SIP parties where the PSTN is not involved (true data connection
end to end). Calling from branch to branch is again, using the data
network for the call which doesn’t cost anything if you already
have the network in place. SIP calls to a user work much like a
PRI does where you can have a direct dial number (or SIP address)
and with functions like twinning (supported on PRI and SIP, but
not with Analog trunks), you can stay connected to your office.
Presence and IM are indeed helping businesses connect with clients.
SIP indeed, is the future and at some point, there may not be a
PSTN as we know it now.
If set up incorrectly, it can end up costing a lot. A lot
in fraudulent toll calls.
Often the setup costs are low to get started with SIP however, there
are security concerns with SIP. Much to do with the way in which
SIP integrates with everything. That is, how SIP has to know how
to connect to others and how to ring the right devices. And then
to have a secure SIP connection, each “link” would need to support
varying security methods to encrypt the SIP signaling as well as
protecting the actual audio or “media”.
for connecting IP Office to a SIP trunk provider, there are many
ITSP’s out there. Since SIP is based on the many RFC’s written by
and for implementing SIP and associated components, there are as
many interpretations. Therefore, it is best to make sure that a
provider you're considering can integrate with IP Office. There
is more to consider when you look at the connectivity design requirements
for your business needs. IP Office does not encrypt either the SIP
signaling or media (audio) which can be captured and played back
SIP trunks generally means a public connection to an ITSP where
there is a vulnerability to attacks and other threats to businesses.
To protect against these, a Session Border Controller can be used
to separate the connection from the network and internet or ITSP.
Protecting against eavesdropping, toll-fraud, spoofing, along with
Denial of Service attacks are some of the types of threats an SBC
Office SIP Extensions
Office 4.0 and higher supports the use of SIP extension devices
with the IP Office system. These can be SIP phones, SIP software
clients or traditional analog devices attached to the SIP Analog
Telephony Adapter (ATA).
the IP Office configuration, SIP extensions are licensed using the
3rd Party IP End-points license which is also used for non-Avaya
H323 IP extensions. The number of SIP extensions supported is subject
to available licenses and to the normal extension limits of the
IP Office control unit being used.
Unlike H323 IP devices which always support at least one G711 codec,
SIP devices do not support a single common audio codec. Therefore
it is important to ensure that the IP Office SIP extension codecs
configured match a codec for which the SIP device is configured.
Beyond basic call handling via the IP Office (see the features listed
below), the features available will vary between SIP devices and
Avaya cannot make any commitments as to which features will or will
not work or how features are configured.
Border Controller for Enterprise
SBCE support for IP Office soft-clients
The Avaya Session Border Controller for Enterprise (ASBCE) Release
6.2 introduced support for SIP trunks on IP Office R8.1. In IP Office
R9.0, this support is expanded to IP Office Remote Workers for a
selection of softclients when used in conjunction with the ASBCE
Release 6.2 FP1. The following IP Office soft-clients (SIP end points)
are supported with ASBCE 6.2 Feature Pack 1:
Flare Experience iPad, Flare Experience Windows, One-X Mobile Preferred
for Android, One-X Mobile Preferred for iOS
Trunking Application Notes for Avaya IP Office
IP Office R9.1
IP Office R9.0
is a registered trademark of Microsoft Corporation
in the United States and other countries.
Lucent, AT&T, IP Office, Definity, Partner, Merlin, Magix, Intuity
and Audix are registered trademarks of Avaya, Lucent Technologies,