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Secure SIP PBX Configuration

Article ID: 742
Last updated: 14 May, 2020

Secure SIP Queue Manager Enterprise and Auto Attendant configuration

Effective Spring 2020, Imagicle Queue Manager Enterprise and relevant Auto Attendant module supports Secure SIP trunk and Secure RTP audio streams, for calls which are placed with Secure SIP (SIP/TLS) for the signalling and SRTP for the audio stream. Please note this requires at least CuCM versions 11.0 or newer.

Before trying to enable Secure calls, please make sure Imagicle Queue Manager is fully configured to handle Non-Secure calls with clear RTP.

Mixed mode must be enabled on your Unified CallManager, and you must be able to effectively place and receive secure calls to and from the agents' phones.

Cisco Unified CallManagerâ„¢ Configuration

To be able to handle QME secure calls, you need to:

  1. Configure Enterprise Parameters for SRTP.
  2. Load the Imagicle digital certificate on CuCM, categorized as CallManager-trust
  3. Create a SIP Trunk Security Profile which references the Imagicle Certificate
  4. Create a SIP trunk which points to the Imagicle Application Suite machine, port 5063, and uses the SIP Trunk Security Profile

Warning: if a firewall is set between the CallManager nodes and the Application Suite servers, the TCP port 5063 must be allowed on both sides.

Configure Enterprise Parameters for SRTP

The longest cipher key length supported by Imagicle Queue Manager Enterprise for SRTP voice encryption is 128 bit. Therefore, the SRTP cipher set configured on CUCM shall allow such key length.

On CUCM admin portal: 

  • Select System -> Enterprise Parameters
  • Move to the "Security  Parameters" section and ensure the parameter SRTP Ciphers allows AES-128 bit cipher algorithm (hence choose "All Supported Ciphers").

Download the Imagicle Certificate from IAS and Upload it on CUCM

Please follow the procedure highlighted here.

Creating a SIP Trunk Security Profile with Encryption

From the Cisco Unified CM Administration menu, select System, Security, Sip Trunk Security Profile.

Add a new item with the following properties:

  • Incoming Transport Type: TLS
  • Outgoing Transport Type: TLS
  • Incoming port: 5063
  • Accept Out of Dialog Refer: enabled
  • Accept Unsolicited Notification: enabled
  • X.509 Subject Name: enter the Imagicle Digital Certificate Common Name you noted before.

Please mind the certificate name. Do not enter the certificate description. Do not enter the full Subject Name. Enter the Common Name.

If you are unsure, select System, Security, Certificate, and press the Find button. Locate the Imagicle certificate. The Common Name is displayed in the Subject Name column, just after CN=

NOTE: If you need to manage multiple QME nodes, you must specify in the X.509 Subject Name of the SIP Trunk security profile the list of the involved certificates CN (one for each Imagicle server), separated by comma. 
For instance:  WIN-TN8S35M6791,WIN-TN3V45K2V27 

Creating a SIP Trunk for Secure SIP Queue Manager

A Secure Sip Trunk is a standard SIP trunk with the following properties:

  • A descriptive name, such as QME_SIP_Trunk_Encrypted
  • SRTP Allowed enabled
  • Run On All Active Unified CM Nodes enabled

  • Destination Address: the IP Address of the Imagicle Application Suite server
  • Destination Port: 5063
  • SIP Trunk Security Profile: reference the one you just created

Route Patterns

A route pattern is needed to route incoming, encrypted calls to the Queue Manager Enterprise. The route pattern pointing to QME_SIP_Trunk_Encrypted should be defined accordingly with the PBX numbering plan and with the queues phone number. For example, defining a route pattern 8XX will allow to manage queues with phone number 801, 802, etc..

The route patterns and the other rules used to send calls to QME should never change the called party number. This way QME will be able to tell which calls are coming back from the operators or other queues.

Another route pattern must be defined to match the Camp-On prefix. Ensure that allows to reach the configured prefix followed by all the digits of the internal extensions.

Once the system is configured and running, if your extensions are (for example) four digits long (3001, 3002...) you can test Camp-On by dialling *3001.

TAPI devices association

CTI/TAPI Monitoring of operators/agents phones is required. Pls. follow the guidance available here.

Article ID: 742
Last updated: 14 May, 2020
Revision: 3
Views: 42
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