Cisco 7931G Manual

4
The phone displays the security level of the conference call. A secure conference displays (encrypted)
or (authenticated) icon to the right of Conference on the phone screen. If icon displays, the conference
is not secure.
There are interactions, restrictions, and limitations that affect the security level of the conference call
depending on the security mode of the participant’s phones and the availability of secure conference
bridges. See Call Security Interactions and Restrictions, on page 18 for information about these interactions.
Note
Protected Call Identification
A protected call is established when a user phone and the phone on the other end are configured for protected
calling. The other phone can be in the same Cisco IP network, or on a network outside the IP network. Protected
calls can only be made between two phones. Conference calls and other multiple-line calls are not supported.
Establishment of a protected call follows this process:
1
A user initiates the call from a protected phone (protected security mode).
2
The phone displays the icon (encrypted) on the phone screen. This icon indicates that the phone is
configured for secure (encrypted) calls, but this does not mean that the other connected phone is also
protected.
3
A security tone plays if the call connects to another protected phone; the tone indicates that both ends of
the conversation are encrypted and protected. If the call is connected to a nonprotected phone, the secure
tone does not play.
Protected calling is supported for conversations between two phones. Some features, such as conference,
shared lines, Cisco Extension Mobility, and Join Across Lines are not available when protected calling is
configured.
Note
Call Security Interactions and Restrictions
Cisco Unified Communications Manager checks the phone security status when conferences are established
and changes the security indication for the conference or blocks the completion of the call to maintain integrity
and also security in the system. The following table provides information about changes to call security levels
when the Barge feature is used.
Table 4: Call Security Interactions When using Barge
Results of actionCall security levelInitiator phone security
level
Call barged and identified as nonsecure callEncrypted callNonsecure
Call barged and identified as authenticated callAuthenticated callSecure (encrypted)
Cisco Unified IP Phone 7931G Administration Guide for Cisco Unified Communications Manager 9.0 (SCCP
and SIP)
18
Cisco Unified IP Phone 7931G
Authenticated, Encrypted, and Protected Phone Calls

Cisco 7931G Specifications

General

Mounting	Desk/Wall
Handset type	Wired handset
Product type	IP Phone
Product color	Black
Wall mountable	Yes
Electromagnetic compatibility	FCC Part 15 (CFR 47) Class B, ICES-003 Class B, EN55022 Class B, CISPR22 Class B, AS/NZS CISPR 22 Class B, CISPR 24, VCCI Class B, EN55024, EN 50082-1, EN 61000-3-2, EN 61000-3-3, EN 61000-6-1
Wi-Fi	No
Networking standards	IEEE 802.1Q, IEEE 802.1af, IEEE 802.1p
Ethernet LAN interface type	Fast Ethernet
Supported network protocols	DHCP, TFTP, CDP
Lines quantity	24 lines
Phonebook capacity	- entries
Number of VoIP accounts	-
Voice codecs	G.711a, G.729A, G.729B, G.729ab
Volume control	Digital
Display resolution	192 x 64 pixels
Display number of lines	3 lines
Display number of colors	Monochrome
Storage temperature (T-T)	-10 - 60 °C
Operating temperature (T-T)	0 - 40 °C
Operating relative humidity (H-H)	10 - 95 %
Safety	(UL) 60950, (CSA) C22.2 No. 60950, EN 60950, IEC 60950, AS/NZS60950, TS 001
Number of handles included	1 pc(s)

Weight and Dimensions

Depth	229 mm
Width	203 mm
Height	178 mm
Weight	1360 g