Chapter 4
Basic and Additional SIP Services
Additional SIP Services
4-6
Cisco IP Phone Models 7905G and 7912G Administrator Guide (SIP)
OL-4277-01
Distinctive
ringing support
If an incoming INVITE contains an Alert-Info header
with the name Bellcore-dr1, Bellcore-dr2,
Bellcore-dr3, Bellcore-dr4, or Bellcore-dr5, the phone
will play the ring pattern r
n
, where n = 1, 2, 3, 4, or 5 as
specified in Bellcore GR506. If the Alert-Info header is
not present or if the ring pattern name is unknown, the
phone will play the default ring pattern Bellcore-dr1.
—
DNS SRV
support
The Cisco IP Phone supports DNS SRV lookup for the
SIP proxy server. If the Proxy parameter value is a
domain name, the phone performs a DNS SRV lookup
for the SIP proxy server. A DNS SRV lookup results in
one of the following conditions:
•
Zero host is returned or DNS SRV lookup failed.
The phone then performs a regular DNS A-record
lookup for the given name.
•
One host is returned. The single host is used as the
primary proxy farm.
•
Two or more hosts are returned. The two hosts with
the highest priorities are used as the primary and
backup proxy farms.
See the
Hardware
information
You can view Cisco IP Phone hardware information on
the phone’s Model Information menu and on the Device
Information area in a phone’s web page.
See the
Information Menu”
section on page 5-17
and
the
Table 4-2
Additional SIP Services (continued)
SIP Service
Description
Reference
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