Assumption:

 Functions related:

// It can be done in one of the two ways:
// 1) send a warning signal using the standard signaling system of phone network
// 2) send the sender a real fax, in which warningMsg will be printed
}

 Int numberOfPagesInFax(String &faxContent)
{// return how many pages there are in the fax
}

Int faxToGif( String &faxContentInGif[], String & faxContent)
{// This function converts fax format (TIFF) image to a sequence of GIF format images ,
//each image contains a fax page.

// It can be done in the steps :
// 1) convert TIFF format to PPM format
// 2) convert PPM format to GIF format
// Note : PPM is a very simple format of image, no compression is used in this format.
// Using it as a bridge between TIFF format and GIF format can make life easier.
}

Int MIMESent(String & recipientEmailAddr, String & faxContentInGif [])
{ // This function will encode a sequence of GIF format images to a MIME mail, then send to the recipient.
}

void faxProcess(int phoneNumberOfRecipient, String & faxContent)
{ // This is the main processing function for fax, it'll call all the functions above as well as the DirectoryService and Signaling service

DirectoryService faxDir;
String recipientEmailAddr;
Int numberOfPages=numberOfPagesInFax(faxContent);
String faxContentInGif[numberOfPages];
Int status;
recipientEmailAddr= faxDir.getEmailAdd(phoneNumberOFRecipient);
If(recipientEmailAddr.length()==0){