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[efax-users] cannot send fax: received RTN - page not OK, check channel
Fax call messages for multiple pages of transmission are illustrated in Fig. In this section, an overview of fax call flow messages is given. Complete details, several messages, various options, and errors are given in the T. Phase A is the call establishment, and this is achieved either manually or automatically. Phase B is the premessage procedure for call control and capabilities exchange. The major steps of this phase are as follows: Figure PSTN fax call phases.
PSTN FAX CALL PHASES (VoIP)
Twilio FAX Send