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Use this object to configure early Media support.

To View and Edit Early Media

On SBC main screen, go to Configuration > System Provisioning > Category: Trunk Provisioning > Trunk Group > Sip Trunk Group > Sip Trunk Advanced > SIP Trunk - Media - Advanced > Early Media. The Early Media window is displayed.

The Early Media can be checked for each Address Context, for each Zone, for each Sip Trunk Group created or for all the Address Contexts, Zones and Sip Trunk Groups created. Use the drop-down box to select the desired Address Context, Zone and Sip Trunk Group.

The Edit Early Media window is displayed.

Sip Trunk Advanced - SIP Trunk Media Advanced Early Media

The following fields are displayed:

Media - Early Media Parameters

Parameter

Description

Method

 Method used to provide early media.

  • pEarlyMedia– P-Early-Media header value is used for selection the RTP streams.
    • defaultGatingMethod – Select an option to specify the cut-through method if p-early-media header is   not received from peer.
      • inactive
      • recvonly
      • sendonly
      • sendrecv (default)
    • egressSupport - Use this flag to include PEM=supported message in the egress INVITE.
      • disabled - Egress INVITE does not include PEM=supported message regardless of the presence/absence of PEM in the ingress INVITE.
      • enabled (default) – Egress INVITE includes PEM=supported message regardless of the presence/absence of the PEM in the ingress INVITE.
  • rtpServerTable – Enter an RTP Server Table name to specify the RTP server profile. This option uses RTP Server Profile to determine whether early media is enabled. If the c-line of the session description matches an   entry in the RTP profile, early media is allowed. RTP Server Profiles are configured per Address Context. One RTP Server Profile is tied to a single Early Media Profile if this option is selected.
  • sessionAnswer (default) – Use this option for media cut-through on receipt of session answer.

Forking Behaviour

 Use this parameter to identify the method to provide early dialog media selection.
  • firstProvResponse – First Reliable Provisional response. Cut through for first provisional response and suppress the rest until final response is received.
  • firstRtp – When this option is selected, the SBC's selection of provisional response for cut-through is determined by the arrival of media packets corresponding to that provisional response. Select this option and set dynamicLRBT flag to 'enabled' when forking is enabled. With firstRtp enabled, forking behavior is the last provisional response until 180 is received. If firstRtp is enabled, but dynamicLRBT flag is disabled, forking behavior defaults to the last provisional response
  • lastProvResponse (default) – Last Reliable Provisional response. Cut through when the latest provisional response with SDP is received.
  • pemPriority – PEM (P-Early-Media) based. Cut through occurs based on the value of the PEM header (default value is sendrecv if not configured).

Make the required changes and click Save at the right hand bottom of the panel to save the changes made.

 

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