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SDP attributes defined in RFC 7195

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Setting Audio and Video Media Streams over Circuit-Switched Bearers in the PSTN
cs-correlation

RFC 7195 – Section 5.7

a=cs-correlation:   (media-level)


attribute   =/
cs-correlation-attr   =
"cs-correlation:"   corr-mechanisms

corr-mechanisms   =
corr-mech   *( SP   corr-mech )

corr-mech   =
caller-id-mech   =
"callerid"   [ ":"   caller-id-value ]

caller-id-value   =
"+"   1*15DIGIT

uuie-mech   =
"uuie"   [ ":"   uuie-value ]

uuie-value   =
1*65( HEXDIG   HEXDIG )
;  this represents up to 130 HEXDIG (65 octets)

dtmf-mech   =
"dtmf"   [ ":"   dtmf-value ]

dtmf-value   =
1*32( DIGIT  /  %x41-44  /  %x23  /  %x2A )
;  0-9, A-D, '#' and '*'

external-mech   =
"external"

ext-mech   =
ext-mech-name   =
ext-mech-value   =