Some of the SIP IEs have predefined values. The following tables specify the SIP IE and list these values:
SIP IE |
Decimal value |
SDP_MEDIA_TYPE_AUDIO |
1 |
SDP_MEDIA_TYPE_NAS |
2 |
SDP_MEDIA_TYPE_VIDEO |
3 |
SDP_MEDIA_TYPE_APP |
4 |
SDP_MEDIA_TYPE_DATA |
5 |
SDP_MEDIA_TYPE_IMAGE |
6 |
SDP_MEDIA_TYPE_CONTROL |
7 |
SIP IE |
Value |
SIP_IE_SDP_MEDIA_PORT_ANY |
1* |
SIP_IE_SDP_MEDIA_PORT_NOTSET |
2* |
SIP_IE_SDP_MEDIA_PORT_IGNORE |
3* |
Actual port number |
Numeric value |
* These values do not correspond to port numbers.
SIP IE |
Decimal value |
SDP_MEDIA_PROTOCOL_RTP |
1 |
SDP_MEDIA_PROTOCOL_LOCAL |
2 |
SDP_MEDIA_PROTOCOL_ATM |
3 |
SDP_MEDIA_PROTOCOL_UDP |
4 |
SDP_MEDIA_PROTOCOL_TCP |
5 |
For SIP_IE_ENCODING, see RFC 1890 for the assigned encodings. The following table lists some typical values:
Encoding method |
Value |
G711 mu-law |
0 |
G711 A-law |
8 |