Softphone and CTI Modes

The Cloud Voice App Web Client runs in one of two modes, softphone or CTI. Which you pick comes down to where you want calls to ring and which device carries the audio.

Softphone mode

In softphone mode the Web Client is a complete software phone inside your browser. It sends and receives calls over the internet directly from your computer, so it stands in for a physical desk phone. On top of standard calling it adds the extras you expect from a modern app, such as messaging, video calls, and presence.

Choose softphone mode when there is no desk phone at your workspace. Everything happens on your computer, including:

• Placing and ending a call
• Starting a second call
• Answering or rejecting an incoming call
• Muting and unmuting
• Blind and attended transfers (blind sends the caller straight to the destination; attended lets you speak to the destination first, then complete the transfer)
• Recording a call
• Holding and resuming
• Swapping between held calls
• Adding a participant
• Merging calls
• Flipping a call to another device
• And more

CTI mode

Computer Telephony Integration (CTI) links your computer to the phone system so you can drive calls from your screen while the audio runs through a separate device. Switch the Web Client to CTI mode when you would rather talk on a desk phone, the Desktop Client, or the Mobile Client. In this arrangement the Web Client acts as an on-screen control panel: you click to answer, transfer, hold, and so on, but the call itself connects through the endpoint you have paired it with.

Caution

In CTI mode the Web Client only sends control commands; the call audio always runs through the paired device. Keep that device (a desk phone, the Desktop Client, or the Mobile Client) signed in and reachable, otherwise the on-screen buttons have nothing to control.

You can pair the CTI panel with an IP phone, the Desktop Client, or the Mobile Client. The operations you can perform depend on which endpoint is connected, as the table below shows.

Note

• CTI works only with specific IP phone models on supported firmware. Check the compatibility tables later on this page for supported Yealink, Fanvil, Snom, and Grandstream phones.
• Video calling and function keys are not available while the Web Client is in CTI mode.

Supported call operations

A checkmark (✓) means the operation is available for that endpoint; a cross (✗) means it is not.

Operation	Compatible Yealink / Fanvil / Snom / Grandstream IP phones	Other IP phones	Desktop Client	Mobile Client
Make / end a call	✓	✓	✓	✓
Make a second call	✓	✗	✓	✗
Answer a call	✓	✗	✓	✗
Reject a call	✓	✓	✓	✓
Hold / resume a call	✓	✓	✓	✓
Mute / unmute a call	✗	✗	✗	✗
Blind transfer a call	✓	✓	✓	✓
Attended transfer a call	✓	✗	✓	✗
Record a call	✓	✓	✓	✓
Swap hold	✓	✗	✓	✗
Add participant	✗	✗	✓	✗
Merge calls	✗	✗	✓	✗
Flip a call	✓	✗	✓	✓
Transcribe a call	✗	✗	✓	✓

Compatible IP phones

Only the models listed below, running the stated firmware version or newer, can be controlled by the Web Client in CTI mode.

Yealink

Phone model	Firmware version
SIP-T21P_E2	52.84.0.125 or later
SIP-T21_E2	52.84.0.125 or later
SIP-T23P	44.84.0.125 or later
SIP-T23G	44.84.0.125 or later
SIP-T27G	69.85.0.5 or later
SIP-T29G	46.83.0.120 or later
SIP-T30P	124.85.0.15 or later
SIP-T31	124.85.0.15 or later
SIP-T31P	124.85.0.15 or later
SIP-T31G	124.85.0.15 or later
SIP-T33P	124.85.0.15 or later
SIP-T33G	124.85.0.15 or later
SIP-T31W	124.86.0.75 or later
SIP-T34W	124.86.0.75 or later
SIP-T40P	54.84.0.125 or later
SIP-T40G	76.84.0.125 or later
SIP-T41P	36.83.0.120 or later
SIP-T42G	29.83.0.120 or later
SIP-T46G	28.83.0.120 or later
SIP-T48G	35.83.0.120 or later
SIP-T41S	66.85.0.5 or later
SIP-T42S	66.85.0.5 or later
SIP-T46S	66.85.0.5 or later
SIP-T48S	66.85.0.5 or later
SIP-T41U	108.85.0.39 or later
SIP-T42U	108.85.0.39 or later
SIP-T43U	108.85.0.39 or later
SIP-T46U	108.85.0.39 or later
SIP-T48U	108.85.0.39 or later
SIP-T44U	108.86.0.90 or later
SIP-T44W	108.86.0.90 or later
SIP-T52S	70.84.0.70 or later
SIP-T54S	70.84.0.70 or later
SIP-T53	96.85.0.5 or later
SIP-T53W	96.85.0.5 or later
SIP-T54W	96.85.0.5 or later
SIP-T57W	96.85.0.5 or later
SIP-T73W	185.87.0.15 or later
SIP-T73U	185.87.0.15 or later
SIP-T74LTE	185.87.0.33 or later
SIP-T74LTE(US)	185.87.0.33 or later
SIP-T74W	185.87.0.15 or later
SIP-T74U	185.87.0.15 or later
SIP-T77U	185.87.0.15 or later
SIP-T85W	185.87.0.15 or later
SIP-T87W	185.87.0.15 or later
SIP-T88W	192.87.0.5 or later
SIP-T88V	192.87.0.5 or later
T64LTE	132.86.0.25 or later
T67LTE	132.86.0.35 or later
SIP-T56A	58.83.0.15 or later
SIP-T58	58.85.0.5 or later
SIP-T58W	150.86.0.5 or later
VP59	91.85.0.5 or later
AX83H	180.86.0.5 or later
AX86R	180.86.0.5 or later

Fanvil

Phone model	Firmware version
X1S/X1SP	2.2.12 or later
X1SG	2.2.12 or later
X3SG	2.2.12 or later
X3U	2.2.12 or later
X2/X2P	2.14.0.7386 or later
X2C/X2CP	2.14.0.7386 or later
X3S/X3SP/X3G	2.14.0.7386 or later
X4/X4G	2.14.0.7386 or later
X4U	2.2.11 or later
X4U-V2	2.12.1 or later
X5U	2.2.11 or later
X5U-V2	2.12.1 or later
X5S	2.2.1 or later
X6	2.2.1 or later
X6U	2.2.11 or later
X6U-V2	2.12.1 or later
X7	2.2.11 or later
X7C	2.2.11 or later
X7A	2.2.0.229 or later
i56A	2.8.13 or later
A32	2.6.0.408 or later
A32i	2.6.0.408 or later
X210	2.2.11 or later
X210i	2.2.11 or later
X7-V2	2.12.1.3 or later
X7C-V2	2.12.1.3 or later
X210-V2	2.12.1.3 or later
X210i-V2	2.12.1.3 or later
V65	2.12.2.4 or later
X3S/X3SP Lite	2.4.5 or later
X3S/X3SP Pro	2.4.5 or later
X3SW	2.4.5 or later
X3SG Lite	2.4.5 or later
X3SG Pro	2.4.5 or later
X3U Pro	2.4.5 or later
V62	2.4.10 or later
V63	2.12.16.19 or later
V64	2.4.10 or later
A320	2.6.0.1402 or later
A320i	2.6.0.1402 or later
V67	2.6.0 or later
X301	2.12.2 or later
X301G	2.12.2 or later
X301W	2.12.2 or later
X303	2.12.2 or later
X303G	2.12.2 or later
X303W	2.12.2 or later
X305	2.12.1.6 or later
X306	2.12.20.4 or later
X303-2 WIRE	1.0.3 or later
W610W	2.12.0 or later
W611W	2.12.4.8 or later
W620W	2.16.2 or later
W626W	2.16.30 or later
V61G	2.12.18.8 or later
V61W	2.12.18.8 or later
V62G	2.12.18.8 or later
V62W	2.12.18.8 or later
V66 Pro	2.12.18.4 or later
V66	2.12.18.4 or later
V62 Pro	2.12.18.2 or later
W710D	1.18.11 or later
A308i	2.6.10.1177 or later
H1-2 Wire	2.12.1 or later
H603W	2.14.0.11 or later
V50G	2.12.23.5 or later
V50P	2.12.20.4 or later
V60G	2.12.20.34 or later
V60P	2.12.20.3 or later
V60W	2.12.20.3 or later

Snom

Phone model	Firmware version
D120	10.1.54.13 or later
D140	10.1.148.1 or later
D150	10.1.148.1 or later
D315	10.1.73.16 or later
D335	10.1.73.16 or later
D385	10.1.73.16 or later
D710	8.9.3.80 or later
D712	8.9.3.61 or later
D713	10.1.73.16 or later
D715	10.1.33.33 or later
D717	10.1.73.16 or later
D720	8.9.3.80 or later
D725	10.1.175.16 or later
D735	10.1.73.16 or later
D765	10.1.73.16 or later
D785	10.1.73.16 or later
D810	10.1.198.22 or later
D812	10.1.184.14 or later
D815	10.1.184.14 or later
D862	10.1.137.15 or later
D865	10.1.137.15 or later
D892	10.1.214.2 or later
D895	10.1.214.0 or later
SP800	10.1.169.15 or later

Grandstream

Phone model	Firmware version
GHP610W	1.0.1.71 or later
GHP611W	1.0.1.71 or later
GHP620W	1.0.1.71 or later
GHP621W	1.0.1.71 or later
GHP630W	1.0.1.71 or later
GHP631W	1.0.1.71 or later
WP825	1.0.11.67 or later