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ABNF for SIP Private Headers

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SIP Header — P-Asserted-Service

RFC 6050Section 4.1
See also:  P‑Preferred‑Service

PAssertedService =
"P‑Asserted‑Service"  HCOLONPAssertedService‑value
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PAssertedService-value =
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Service-ID =
"urn:urn‑7:"  urn‑service‑id
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urn-service-id =
top‑level  *( "."  sub‑service‑id )
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top-level =
let‑dig  [ *26let‑dig ]
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sub-service-id =
let‑dig  [ *let‑dig ]
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let-dig =
ALPHA /  DIGIT /  "-"
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