In this section:
The Transparency Profile is the recommended method of configuring transparency on the SBC Core for new deployments as well as when applying additional transparency configurations to existing deployments. Do not use IP Signaling Profile flags in these scenarios because the flags will be retired in upcoming releases. Refer to the SBC SIP Transparency Implementation Guide for additional information.
IMPORTANT
Event Transparency
The SBC transparently passes the following content types associated with the specified MMTel services:
Content Types for Event Transparency
| Service Name | Method | Event Name | Content Type |
|---|---|---|---|
CDIV | SUBSCRIBE | comm-div-info | application/comm-div-info-filter+xml |
CDIV | NOTIFY | comm-div-info | application/comm-div-info-ntfy+xml |
CCBS | SUBSCRIBE (O-AS subscribes to T-AS if the user is Busy) | Call-Completion | |
CCBS | NOTIFY (O-AS subscribes to T-AS if the user is Busy) | Call-Completion |
application/call-completion |
CCBS | Publish (If the CCBS service fails, O-AS sends Publish with closed as state to T-AS) | Presence | application/pidf+xml |
Message Body Transparency
The SBC transparently passes the following content-types associated with the specified MMTel services:
Content Types for Message Body Transparency
| Service Name | Request/Response | Content-Type |
|---|---|---|
CCBS | 486 Response | Message/externalbody |
AOC | INFO,BYE, and 200 OK for INVITE, 18x Response INVITE, 200 OK for BYE | vnd.etsi.aoc+xml |
CW | INVITE | application/vnd.3gpp.cw+xml (MIME Body) |
MCID | INFO | application.vnd.etsi.mcid+xml |
| CRS | INVITE | application/vnd.3gpp.crs+xml |
| CUG | INVITE | application/vnd.etsi.cug+xml |
| USSD | INVITE, INFO, BYE | application/vnd.3gpp.ussd |
Header Transparency
The SBC transparently passes Recv-Info and Info-Package headers to support MMTel Services.
The following MMTel supplementary services use 199 response code:
- Communication Completion Services (CCNR in particular)
- Customized Alerting Tones (CAT)
Refer to Supplementary Services topic for a list of MMTel supplementary services.
Overview
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