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Session Description  Addressing  generic rules  "a=" SDP Attributes
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SDP attributes defined in

RFC 7195 – Setting Audio and Video Media Streams over CS Bearers in the PSTN

RFC 7195 – Section 5.7
a=cs-correlation

 

attribute  =/
cs-correlation-attr
cs-correlation-attr =
"cs-correlation:"  corr-mechanisms
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corr-mechanisms =
corr-mech  *( SP  corr-mech )
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corr-mech =
caller-id-mech /  uuie-mech /  dtmf-mech /  external-mech /  ext-mech
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caller-id-mech =
"callerid"  [ ":"  caller-id-value ]
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caller-id-value =
"+"  1*15DIGIT
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uuie-mech =
"uuie"  [ ":"  uuie-value ]
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uuie-value =
1*65( HEXDIG  HEXDIG )
; this represents up to 130 HEXDIG (65 octets)
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dtmf-mech =
"dtmf"  [ ":"  dtmf-value ]
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dtmf-value =
1*32( DIGIT /  %x41-44 /  %x23 /  %x2A )
; 0-9, A-D, '#' and '*'
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external-mech =
"external"
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ext-mech =
ext-mech-name  [ ":"  ext-mech-value ]
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ext-mech-name =
token
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ext-mech-value =
token
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