CHAPTER23 Digital PSTN
Mediant 1000 Gateway & E-SBC | User's Manual
â– Ring Down (Ring and No Ring states): This event signals a ring or no ring state. An
example is when the user lifts the handset or pushes a button on the phone to alert the far-end
user, which instantly sends ringing to the far end (even though they are already connected).
This is also known as Automatic Ring Down (ARD) or Manual Ring Down (MRD).
â– TOS (transmission only service): If neither Ring Down or Hook Switch modes are specified
in the INVITE, TOS is assumed. In this case, the device ignores all CAS signaling, replies with
200 OK and opens a media channel.
These special private wire events are signaled during a call using the SIP INFO message in
association with the INFO package (per IETF draft). The INFO package is the INFO message's
b
od
y,
w
hich
is
in
X
ML
s
che
ma
.
Th
e
r
oo
t
e
lem
en
t
o
f
t
h
e
XML
is
"
<pws
ign
a
l>
"
,
w
h
ic
h
c
on
t
a
ins
t
w
o
child elements:
â– "<ringDown>" - requests a local Ring Down alert
â– "<hookSwitch>" - requests a Hook Switch alert:
â—† "onHook" - signals that the endpoint is not in use
â—† "offHook" - signals that the endpoint is in use
The following is an example of the XML for private wire signaling in the SIP INFO message:
<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema targetNamespace="urn:bt-trs:params:xml:ns:private-wire:0"
xmlns="urn:bt-trs:params:xml:ns:private-wire:0"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
elementFormDefault="qualified"
version="0.1">
<xsd:annotation>
<xsd:documentation xml:lang="en">Version 0.1 Draft XML schema
for Private Wire Signalling in SIP INFO body
</xsd:documentation>
</xsd:annotation>
<!-- pwSignal -->
<xsd:complexType name="pwSignallingType">
<xsd:sequence>
<xsd:choice>
<xsd:element ref="ringDown" />
<xsd:element ref="hookSwitch" />
<xsd:any namespace="##other" minOccurs="0"
maxOccurs="unbounded" processContents="lax" />
</xsd:choice>
</xsd:sequence>
<xsd:anyAttribute namespace="##other" processContents="lax" />
</xsd:complexType>
<xsd:element name="pwSignal" type="pwSignallingType"/>
<!-- ringDown -->
<xsd:complexType name="ringDownType">
<xsd:sequence>
<xsd:any namespace="##other" minOccurs="0"
maxOccurs="unbounded" processContents="lax" />
</xsd:sequence>
<xsd:attribute name="signal" type="ringDownSignalType" use="required"/>
<xsd:anyAttribute namespace="##other" processContents="lax" />
- 563 -
To Next Page
Loading...
Need help?
General
