Use this object to configure early Media supportUse the Early Media window to configure parameters related to early media processing for a specified SIP trunk group.
To View and Edit Early Media Parameters
On the SBC main screen, go to Configuration > System Provisioning > Category: Trunk Provisioning > Trunk Group > Sip SIP Trunk Group > Sip SIP Trunk Advanced > SIP Trunk - Media - Advanced > Early Media. or
All > Address Context > Zone > SIP Trunk Group > Media > 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 boxes to select the desired an Address Context, Zone and Sip SIP Trunk Group.
The Edit Early Media window is displayed.
| Caption |
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| 0 | Figure |
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| 1 | Sip Trunk Advanced - SIP Trunk Media Advanced Early Media Window |
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The following fields are displayed:
| Caption |
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| 0 | Table |
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| 1 | Media - Early Media Parameters |
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Parameter | Description |
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Method | Method used to provide early media. Additional options appear based on your choice for Method. pEarlyMediaP Early Media – P-Early-Media header value is used for selection the RTP streams.defaultGatingMethod Default Gating Method – Select an option to specify the cut-through method if pthe P- earlyEarly-media Media header is not received from the peer.- Inactive
- None
inactive recvonlyRecvonlysendonlySendonlysendrecvSendrecv (default)
egressSupport Egress Support - Use this flag to include PEMinclude a PEM=supported message in the egress INVITE.
disabled Disabled - Egress INVITE does not include PEM=supported message regardless of the presence/absence of PEM in the ingress INVITE.enabled Enabled (default) – Egress INVITE includes PEM=supported message regardless of the presence/absence of the PEM in the ingress INVITE..
- Monitor Rtp - Use this flag to monitor RTP for early media authorization when the flag Default Gating Method is set to None.
- Disabled (default)
- Enabled
- Rtp Server Table
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 Session Answer (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 Prov Response – First Reliable Provisional response. Cut through for first provisional response and suppress the rest until final response is received.firstRtp First Rtp – 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 set Dynamic LRBT flag to 'enabled' when forking is enabled. With firstRtp First Rtp enabled, forking behavior is the last provisional response until 180 is received. If firstRtp First Rtp is enabled, but dynamicLRBT the Dynamic LRBT flag is disabled, forking behavior defaults to the last provisional responselastProvResponse Last Received SDP (default) – Last Reliable Provisional response. Cut through when the latest provisional response with SDP is received.– Cut through is based on the latest SDP received.- Pem Priority
pemPriority – PEM (P-Early-Media) based. Cut through occurs based on the value of the PEM header (default value is sendrecv if not configured).
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Make the required changes and click Save at the right hand bottom of the panel to save the changes made.