L1: resurrect TCH tap feature In this new incarnation of our TCH tap feature, we support DL sniffing in all 3 of FR1, HR1 and EFR, and the new implementation will capture every 20 ms frame where the old one silently skipped a frame (sent nothing) during FACCH stealing. The wire interface on RVTMUX changed slightly, and fc-shell tch record will need to be updated to support the new version. TCH UL play or substitution is supported for FR1 and EFR only; support for HR1 can be added later if needed.

--- a/src/cs/layer1/cfile/l1_init.c	Tue Mar 29 04:41:25 2022 +0000
+++ b/src/cs/layer1/cfile/l1_init.c	Tue Dec 13 02:44:01 2022 +0000
@@ -1889,6 +1889,8 @@
     Cust_navc_ctrl_status(1);//start - NAVC
  #endif//end of (OP_L1_STANDALONE == 1 || L1_NAVC == 1 )
 
+  /* FreeCalypso addition */
+  tch_tap_init();
 }
 
 /*-------------------------------------------------------*/