callerid_full_tz_generate
in callerid.c supports sending an SDMF spill instead of an MDMF spill: https://github.com/asterisk/asterisk/blob/master/main/callerid.c#L1051
However, chan_dahdi currently always sends MDMF spills. Some CPE (mostly older) only supports SDMF. An option needs to be added to allow choosing between SDMF and MDMF on a per-channel basis, defaulting to MDMF.
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