The early media refers to the media (for example, audio and video) played to the caller before a SIP call is actually established.
Current implementation supports early media through the 183 message. When the caller receives a 183 message with SDP before the call is established, a media channel is established. This channel is used to provide the early media stream for the caller.
You can also configure 180 ring workaround which defines whether to deal with the 180 message received after the 183 message. When the caller receives a 183 message, it suppresses any local ringback tone and begins to play the media received. 180 ring workaround allows the phones to resume and play the local ringback tone upon a subsequent 180 message received.
The following table lists the parameters you can use to configure the early media.
| Parameter | DBID_SIP_EARLY_MEDIA_SUPPORT |
|---|---|
| Description | It enables or disables the phone to deal with the 180 SIP message received after the 183 SIP message. |
| Permitted Values | 0-Disabled 1-Enabled,the phone will resume and play the local ringback tone upon a subsequent 180 message received. |
| Default | 1 |
| Web UI | SIP Account > Line X [1] > Advanced > SIP Advanced Setup > Early Media Support |
| Parameter | DBID_SIP_P_EARLY_MEDIA_SUPPORT |
|---|---|
| Description | It enables or disables the phone to add P-Early-Media to the SIP header of the INVITE message. |
| Permitted Values | 0-Disabled 1-Enabled |
| Default | 1 |
| Web UI | SIP Account > Line X [1] > Advanced > SIP Advanced Setup > P-Early Medai Support |
[1] X is the account ID. X = 1-4
Last editor：admin Update time：2023-12-22 13:50
