henningw left a comment (kamailio/kamailio#4336)

As I know "urn" cannot contain @ char. Here is RFC link

     service-URN  = "URN:service:" service
     service      = top-level *("." sub-service)
     top-level    = let-dig [ *25let-dig-hyp let-dig ]
     sub-service  = let-dig [ *let-dig-hyp let-dig ]
     let-dig-hyp  = let-dig / "-"
     let-dig      = ALPHA / DIGIT
     ALPHA        = %x41-5A / %x61-7A   ; A-Z / a-z
     DIGIT        = %x30-39 ; 0-9

As I understanding allowed letters, digits and "-" char only.

Yes, but this is the standard for the URN service namespace, not the generic URN standard.

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