Bug#340627: bristuff is missing in asterisk

[Thomas Renard]

SID Asterisk is not compiled with bristuff included. So there are no
bristuff signalling tags in chan_zap.so (which is in asterisk!). Please
follow bugs in asterisk for further information.

Tzafrir Cohen mentions:

Kilian Kraus is now working on a bold attempt to build both bristuffed
an both bristuffed Asterisk in the same build. Hopefully this will
actually work.

If not, we'll be faced with a touch decision of to bri or not to bri.