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laforge, 04/24/2018 03:20 PM
RTP Payload Formats¶
There are plenty different RTP payload formats around
Known Formats¶
GSM-FR as per IETF RFC 3551¶
GSM-FR as per ETSI TS 101 318¶
GSM-EFR as per IETF RFC 3551¶
GSM-EFR as per ETSI TS 101 318¶
GSM-HR as per IETF RFC 5993¶
GSM-HR as per ETSI TS 101 318¶
AMR as per IETF RFC 4867¶
AMR-WB as per IETF RFC 4867¶
Audio at various Interfaces¶
SIP-I based CS¶
This is closest to what osmo-sip-connector offers to the outside world, and hence what we'd have to support from the msc-colocated MGW.
See 3GPP TS 26.103 Section 7 3GPP Codecs for OoBTC in a SIP-I -based Circuit Switched Core Network
- AMR as per RFC 4867
- EFR as per RFC 3551
- FR as per RFC 3551
- HR as per RFC 5993
- PCMA as per RFC 5993
- PCMU as per RFC 3551
- audio/telephone-event as per RFC 4733
3GPP AoIP¶
It's surprisingly hard to find where the RTP payload details for AoIP are specified... It's in 3GPP TS 48.103 Section 5.4.2.2
Codec | RTP PT | Spec | Clock Freq |
---|---|---|---|
uLaw | 0 | RFC 3551 | 8 kHz |
aLaw | 8 | RFC 3551 | 8 kHz |
GSM FR | 3 | RFC 3551 | 8 kHz |
GSM EFR | 110 | RFC 3551 | 8 kHz |
GSM HR | 111 | RFC 5993 | 8 kHz |
AMR-NB | 113 | RFC 4867 | 8 kHz |
AMR-WB | 120 | RFC 4040 | 16 kHz |
CSD | 121 | RFC 4040 + RFC 2198 | 8 kHz |
Updated by laforge about 6 years ago · 2 revisions