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 “SIP Parameters”
section on page 8-9.
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 “Model
Information Menu”
section on page 5-17 and
the “Device Information”
section on page 7-4.
Table 4-2 Additional SIP Services (continued)
SIP Service Description Reference
