System Requirements

Bandwidth Requirements

CloudLink applications work with IPv4 and IPv6 networks. A CloudLink mobile application will connect to the user’s preferred Wi-Fi network if that network is available. If the preferred Wi-Fi network is not available, the application will connect to an LTE network. The application can use 2G, 3G, 4G, and 4G LTE networks but the voice quality and the connectivity depend on the network strength.

Note: CloudLink application embedded SIP soft phones should not be statically provisioned with an address on the local network. When a customer’s network has active IPv6 routers they must have some form of automatic distribution of addresses to a mobile community (SLAAC or DHCPv6).

The following table lists the recommended bandwidths for a single CloudLink application call.

Network	Kbps	Codec
Wi-Fi	220	G.711 and Opus
3G/4G	110	G.711

If bandwidth is insufficient, the web or mobile application user might encounter voice quality degradation, slow response, service interruption, and loss of service.

Network Topology

The following diagram provides a visual representation of the CloudLink network.

Figure 1. Network Topology

DSP Requirements

The following table lists the DSP requirements for a single CloudLink application call.

CloudLink Application Call Scenario	DSP Requirements
Call from MiVoice Office Mobile Application (MOMA) on mobile data network to SIP phone (Figure 2)	0 VoIP Channel
Call from MOMA on mobile data network to MOMA on mobile data network (Figure 3)	0 VoIP Channel
Call from MOMA on mobile data network to SIP trunk with Direct Switching (Figure 4)	0 VoIP Channel
Call from MOMA on mobile data network to SIP trunk with Indirect Switching (Figure 5)	2 VoIP Channels
Call from Mitel One web application/MiVoice Office Web Application (MOWA)/MOMA on external WiFi to SIP phone (Figure 6)	0 VoIP Channel
Call from Mitel One web application/MOMA/MOWA on external WiFi to Mitel One web application/MOMA/MOWA on external WiFi (Figure 7)	0 VoIP Channel
Call from Mitel One web application/MOMA/MOWA on external WiFi to digital or analog phone or trunk (Figure 8)	1 VoIP Channel
Call from MOMA (GSM mode, ISDN dial-in) to digital or analog phone (Figure 9)	2 VoIP Channels
Call from MOMA (GSM mode, Dial-in via SIP trunk with Direct Switching) to DSI (Figure 10)	1 VoIP Channel
Call from MOMA (GSM mode, Dial-in via SIP trunk with Indirect Switching) to DSI (Figure 11)	3 VoIP Channels
Call flow when Bandwidth Optimization is disabled (Figure 12)	0 VoIP Channel
Call flow when Bandwidth Optimization is enabled (Figure 13)	0 VoIP Channel

Call Flows in CloudLink Application

The following call flow diagrams provide a visual representation of how a phone call proceeds through the CloudLink mobile phone system to reach the intended users in a non-GSM network.

Figure 2. Call from MOMA on Mobile Data Network to SIP Phone

Figure 3. Call from MOMA on Mobile Data Network to MOMA on Mobile Data Network

Figure 4. Call from MOMA on Mobile Data Network to SIP trunk with Direct Switching

Figure 5. Call from MOMA on Mobile Data Network to SIP trunk with Indirect Switching

Figure 6. Call from Mitel One/MOMA/MOWA on External WiFi to SIP Phone

Figure 7. Call from Mitel One/MOMA/MOWA on External WiFi to Mitel One/MOMA/MOWA on External WiFi

Figure 8. Call from Mitel One/MOMA/MOWA on External WiFi to Digital or Analog Phone or Trunk

Figure 9. Call from MOMA (GSM mode, ISDN dial-in) to Digital or Analog Phone

Figure 10. Call from MOMA (GSM mode, Dial-in via SIP Trunk with Direct Switching) to DSI

Figure 11. Call from MOMA (GSM mode, Dial-in via SIP Trunk with Indirect Switching) to DSI

Bandwidth Optimization

Bandwidth Optimization is designed to reduce internet bandwidth usage for CloudLink calls when callers are operating in the same network as the CloudLink Gateway and MiVoice Office 400. When Bandwidth Optimization is enabled, the media (that consumes the bandwidth) between users in the same network will not be routed to the Mitel CloudLink Platform.

Pre-requisites

To optimize bandwidth utilization for users in a customer account:

The Mitel Partner or an Account Admin of the customer account must enable Bandwidth Optimization for the account. For more information about how to enable Bandwidth Optimization for a customer account, see the section Bandwidth Optimization in Customer Account Information.
Mitel One web application / MiVoice Office Mobile Application (MOMA) / MiVoice Office Web Application (MOWA), CloudLink Gateway, and the MiVoice 400 PBX (MIVO400) must be on the same network.
The company’s internal network must fully route the voice path between the CloudLink Gateway and Mitel One/MOMA/MOWA.
Indirect switching must not be enabled on MIVO400.

Supported Use Cases

Bandwidth Optimization is supported for:

Mitel One/MOMA/MOWA to Mitel One/MOMA/MOWA calls
Mitel One/MOMA/MOWA to other phone endpoints on MIVO400
Mitel One/MOMA/MOWA to trunk calls when the trunks are on MIVO400

When a call is placed, the media is routed to the Mitel CloudLink Platform and then to the CloudLink Gateway. After the call is connected, the media is optimized immediately or as soon as the signaling allows it to be and then the call is routed directly to the CloudLink Gateway, bypassing the Mitel CloudLink Platform, provided that the callers are in the same network, bandwidth optimization is enabled, and the pre-requisites are met.

When you use the call features on Mitel One/MOMA/MOWA, such as place a call, transfer, retrieve, swap, or add a call, Bandwidth Optimization occurs only when the pre-requisites for optimization are met; the call flow will be alternately routed between the CloudLink Platform and the Mitel endpoints on the customer premises.

The following table lists the bandwidth consumed by Mitel One, MOMA and MOWA calls.

Call Flow	Bandwidth Optimization Off	Bandwidth Optimization On
Mitel One/MOMA/MOWA to Mitel One/MOMA/MOWA on WiFi	220 Kbps	60 Kbps
Mitel One/MOWA to 6900 on LAN	110 Kbps	30 Kbps
Mitel One/MOWA to Mitel One/MOWA on LAN	220 Kbps	60 Kbps
MOMA to MOMA on GSM	110 Kbps	110 Kbps

Bandwidth Optimization Call Flow Diagrams

The following call flow diagrams provide visual representations of the media path when Bandwidth Optimization is disabled and enabled, respectively.

Call Flow when Bandwidth Optimization is disabled

When Bandwidth Optimization is disabled, calls between Mitel One/MOMA/MOWA users or between Mitel One/MOMA/MOWA users and PSTN/Trunk users are routed through the internet router to the CloudLink Platform, and then to the CloudLink Gateway. The bandwidth consumed at the internet access connection is that for two concurrent calls.

Figure 12. Call flow when Bandwidth Optimization is disabled

Call Flow when Bandwidth Optimization is enabled

When Bandwidth Optimization is enabled, calls between Mitel One/MOMA/MOWA users or between Mitel One/MOMA/MOWA users and PSTN/Trunk users, in the same network, are routed only through the CloudLink Gateway. Because call flows are not routed through the internet router to the Mitel CloudLink Platform, there is minimal bandwidth consumed at the internet access point, with only signaling maintained throughout the call.

Figure 13. Call flow when Bandwidth Optimization is enabled

Restrictions

Bandwidth Optimization will not work when:

the users are connected to an external network (any network other than the company's internal network) or are using LTE.
Mitel One/MOMA/MOWA, CloudLink Gateway, and MIVO400 are on different networks.
MIVO400 and CloudLink Gateway are deployed in a separate data center by a hosted service provider.

For more details, contact your Mitel Sales Engineer.