Yealink SIP-T48S User Manual

User Guide for the SIP-T48S IP Phone
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to people who are listening to a specific multicast group. You can configure a multicast paging
key or a paging list key on the phone, which allows you to send a Real Time Transport Protocol
(RTP) stream to the pre-configured multicast address(es) without involving SIP signaling. You
can configure the phone to receive an RTP stream from pre-configured multicast listening
address(es) without involving SIP signaling. You can specify up to 31 multicast listening
addresses.
Yealink IP phone supports the following 31 channels:
 0: It is the default channel. This channel is for compatibility with the Yealink IP phones
running firmware version 80 or prior and third-party devices.
 1 to 25: These channels are for compatibility with the Polycom IP phones.
 26 to 30: These channels are used for separate communication among the Yealink IP
phones running firmware version 81 or later.
The IP phones will automatically ignore all incoming multicast paging calls on the different
channel.
Sending RTP Stream
To configure a multicast paging key via phone user interface:
1. Tap More.
2. Tap the desired line key.
3. Tap the gray box of the Type field, and then select Key Event from the pull-down list.
4. Tap the gray box of the Key Type field, and then select Multicast Paging from the
pull-down list.
5. (Optional.) Enter the string that will appear on the touch screen in the Label field.
6. Enter the multicast IP address and port number (e.g., 224.5.6.20:10008) in the Value field.
The valid multicast IP addresses range from 224.0.0.0 to 239.255.255.255.
7. Enter the desired channel in the Channel field.

Yealink SIP-T48S Specifications

General

Mounting	Desk/Wall
Handset type	Wired handset
Product type	IP Phone
Product color	Black
Keypad illumination	Yes
Display diagonal	7 \
Display resolution	800 x 480 pixels
AC adapter input voltage	100 - 240 V
AC adapter output current	2 A
AC adapter output voltage	5 V
USB 2.0 ports quantity	1
Ethernet LAN (RJ-45) ports	2
Front camera	No
Voice codecs	CNG, G.711Mu, G.711a, G.722, G.723.1, G.726, G.729ab, VAD, iLBC
Lines quantity	16 lines
Phonebook capacity	1000 entries
Number of VoIP accounts	16
Dual-Tone Multi-Frequency (DTMF) modes	In-band, Out-of band, SIP info
Keypad number of keys	42
Security algorithms	AES
Networking standards	IEEE 802.3af
Ethernet LAN data rates	10, 100, 1000 Mbit/s
Ethernet LAN interface type	Gigabit Ethernet
Supported network protocols	SIP v1, SIP v2, LLDP/CDP/DHCP, OpenVPN, IEEE802.1X, IPv6, HTTPS
Operating temperature (T-T)	-10 - 50 °C
Operating relative humidity (H-H)	10 - 95 %
Cables included	LAN (RJ-45)
Number of handles included	1 pc(s)
Harmonized System (HS) code	85171800

Weight and Dimensions

Depth	225 mm
Width	266 mm
Height	185 mm
Package depth	263 mm
Package width	324 mm
Package height	128 mm