[asterisk-ss7] sending nondigit char

[Kaloyan Kovachev]

Hello,
 i need to send (and receive) via an ITU ss7 link a number starting with the
letter E, but Asterisk is sending it as 0 and when receiving similar number
sent from our provider i get no number at all and the call fails on the s
extension.

In chan_dahdi.conf there is:

; pridialplan may be also set at dialtime, by prefixing the dialled number with
; one of the following letters:
; U - Unknown
; I - International
; N - National
; L - Local (Net Specific)
; S - Subscriber
; V - Abbreviated
; R - Reserved (should probably never be used but is included for completeness)

but does not work at all for ss7 and even the N prefix (for national) is sent
as 0 according to ss7 debug.

where in the code should i look about changing this behavior?