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The example below shows the connection topology, which includes the following: 

• 3^rd Third-party party PBX, Analog devices and the Administrator's management station, located on the LAN
• Microsoft Teams Direct Routing on the WAN
• SIP trunk from a 3^rd third-party provider on the WAN

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Consult the Microsoft documentation for the Direct Routing interface configuration guidelines, including the RFC standards and the syntax of SIP messages.

Ribbon SBC Edge

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The SBC FQDN must be from one of the Domain names registered in “Domains” of the Tenant. The table below lists Domain Name examples.

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0 Figure 1 Configure Domain Names - Example

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Request a certificate for the SBC External interface and configure it based on the example using GlobalSign as follows:

• Generate a Certificate Signing Request (CSR) and obtain the certificate from a supported Certification Authority.
• Import the Public CA Root/Intermediate Certificate on the SBC.
• Import the Microsoft CA Certificate on the SBC.
• Import the SBC Certificate.

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1. Access the WebUI.
2. Access Settings > Security > SBC Certificates.

3. Click Generate SBC Edge CSR.

   Info
   Many of CA's do not support a private key with size a length of 1024 bits. Validate with your CA requirements and select the appropriate length of the key.

4. Enter data in the required fields.

5. Click OK. Once After the Certificate Signing request finishes generating, copy the result to the clipboard.

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   0 Figure 1 Generate Certificate Signing Request

6. Use the Certificate Signing Request the generated CSR text from the clipboard to obtain the certificate.
    

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After receiving the certificates from the certification authority, install the SBC Certificate and Root/Intermediate Certificates as follows:

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1. In the WebUI, click the Settings tab.

2. In the left navigation page, access System > Node-Level Settings.

3. Configure the NTP and DNS Server with the appropriate configuration.

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   0 Figure 1 Node-level Settings - Example

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SIP server tables defines the information about for the SIP interfaces connected to the Ribbon SBC. It should ; it must be configured to support the Microsoft Phone System.

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Configure Voice routing

Configure Routing Logic using per Ribbon Documentation. Refer to Working with Telephony Routing.

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1. In the WebUI, click the Settings tab.
2. In the left navigation page, access SIP > Transformation Tables
   

3. Click the ( ) icon at the top of  left corner and to add a new Transformation Table.

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   0 Figure 1 Create Transformation Table

4. Configure the parameters as shown below.

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   0 Table 1 Transformation Table - Example Values
   Parameter Value Row ID Assigned by the system Description Microsoft Phone System (example name)

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1. In the WebUI, click the Settings tab.
2. In the left navigation page, access Signaling Groups
   

3. From the Create Signaling Group drop down box, select SIP Signaling Group.

4. Configure the parameters as shown below. Leave the default values for all other parameters as default.

5. Click OK.

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   0 Table 1 Signaling Group Configuration - Example Values
   Parameter Value Description Microsoft Phone System SIP Profile Microsoft Phone System (from the previous steps) Media List ID Microsoft Phone System (from the previous steps) Signaling Media/Source IP Ethernet 1 (example, pick the interface which faces the Microsoft Phone System) Listen Port 5068 (arbitrary port) TLS TLS Profile ID: Microsoft Phone System (from the previous steps) Federated IP/FQDN Refer to Microsoft documentation.sip-all.pstnhub.microsoft.com SIP server table Microsoft Phone System (from the previous steps) Load Balancing Priority SIP Profile Microsoft Phone System (from the previous steps) Call Routing Table Microsoft Phone System (from the previous steps) Outbound NAT traversal[1] Static NAT NAT Public IP 192.168.211.80 (Only required if “Static NAT” is selected) [1] Please ignore if the SBC have has a Public IP assign assigned on his the interface. Only required if The NAT Public IP is required only when the SBC is behind a NAT.

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   0 Figure 1 Signaling Group - Example

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