Que tal amigos espero se encuentren bien , les comento que no eh podido realizar pruebas con otra tarjeta ,lo que hice fue montar una versión de Elastix 2.4 en un servidor mas actual y el resultado es el mismo pero me encontré con estos log , modifique el dnis y ani a 20 en mi configuración
[root@Conmutador2 ~]# tail -f /var/log/asterisk/full
[Oct 30 11:26:17] VERBOSE[3362] chan_dahdi.c: New MFC/R2 call detected on chan 1.
[Oct 30 11:26:17] DEBUG[3362] chan_dahdi.c: Chan 1 - Getting DNIS digit 8
[Oct 30 11:26:17] DEBUG[3362] chan_dahdi.c: Chan 1 - DNIS so far: 8, expected length: 20
[Oct 30 11:26:17] DEBUG[3362] chan_dahdi.c: Chan 1 - Requesting next DNIS with signal 0x31.
[Oct 30 11:26:22] DEBUG[3362] chan_dahdi.c: Chan 1 - calling timer 2 (mf_back_cycle) callback
[Oct 30 11:26:22] DEBUG[3362] chan_dahdi.c: Chan 1 - MF cycle timed out, no more DNIS
[Oct 30 11:26:23] DEBUG[3362] chan_dahdi.c: Chan 1 - calling timer 3 (mf_back_resume_cycle) callback
[Oct 30 11:26:27] DEBUG[3362] chan_dahdi.c: Chan 1 - calling timer 4 (mf_back_cycle) callback
[Oct 30 11:26:27] ERROR[3362] chan_dahdi.c: MFC/R2 protocol error on chan 1: Multi Frequency Cycle Timeout
[Oct 30 11:27:26] VERBOSE[3492] asterisk.c: -- Remote UNIX connection disconnected
[Oct 30 11:28:58] DEBUG[3362] chan_dahdi.c: Chan 2 - Bits changed from 0x08 to 0x00
[Oct 30 11:28:58] DEBUG[3362] chan_dahdi.c: Chan 2 - CAS Rx << [SEIZE] 0x00
[Oct 30 11:28:58] DEBUG[3362] chan_dahdi.c: Chan 2 - Call started at Fri Oct 30 11:28:58 2020 on chan 2 [openr2 version 1.3.1, revision exported]
[Oct 30 11:28:58] DEBUG[3362] chan_dahdi.c: Chan 2 - Initialized R2 MF detector
[Oct 30 11:28:58] DEBUG[3362] chan_dahdi.c: Chan 2 - CAS Tx >> [SEIZE ACK] 0x0C
[Oct 30 11:28:58] DEBUG[3362] chan_dahdi.c: Chan 2 - CAS Raw Tx >> 0x0D
[Oct 30 11:28:58] VERBOSE[3362] chan_dahdi.c: New MFC/R2 call detected on chan 2.
[Oct 30 11:28:58] DEBUG[3362] chan_dahdi.c: Chan 2 - MF Rx << 8 [ON]
[Oct 30 11:28:58] DEBUG[3362] chan_dahdi.c: Chan 2 - Getting DNIS digit 8
[Oct 30 11:28:58] DEBUG[3362] chan_dahdi.c: Chan 2 - DNIS so far: 8, expected length: 20
[Oct 30 11:28:58] DEBUG[3362] chan_dahdi.c: Chan 2 - Requesting next DNIS with signal 0x31.
[Oct 30 11:28:58] DEBUG[3362] chan_dahdi.c: Chan 2 - MF Tx >> 1 [ON]
[Oct 30 11:29:03] DEBUG[3362] chan_dahdi.c: Chan 2 - calling timer 2 (mf_back_cycle) callback
[Oct 30 11:29:03] DEBUG[3362] chan_dahdi.c: Chan 2 - MF cycle timed out, no more DNIS
[Oct 30 11:29:03] DEBUG[3362] chan_dahdi.c: Chan 2 - MF Tx >> 6 [ON]
[Oct 30 11:29:03] DEBUG[3362] chan_dahdi.c: Chan 2 - calling timer 3 (mf_back_resume_cycle) callback
[Oct 30 11:29:03] DEBUG[3362] chan_dahdi.c: Chan 2 - MF Tx >> 6 [OFF]
[Oct 30 11:29:08] DEBUG[3362] chan_dahdi.c: Chan 2 - calling timer 4 (mf_back_cycle) callback
[Oct 30 11:29:08] WARNING[3362] chan_dahdi.c: Chan 2 - MF back cycle timed out!
[Oct 30 11:29:08] ERROR[3362] chan_dahdi.c: Chan 2 - Protocol error. Reason = Multi Frequency Cycle Timeout, R2 State = Seize ACK Transmitted, MF state = Category Request Transmitted, MF Group = Backward Group C, CAS = 0x00
DNIS = 8, ANI = , MF = 0x38
[Oct 30 11:29:08] DEBUG[3362] chan_dahdi.c: Chan 2 - CAS Tx >> [IDLE] 0x08
[Oct 30 11:29:08] DEBUG[3362] chan_dahdi.c: Chan 2 - CAS Raw Tx >> 0x09
[Oct 30 11:29:08] ERROR[3362] chan_dahdi.c: MFC/R2 protocol error on chan 2: Multi Frequency Cycle Timeout
El provedor TEEEEEEELMEX dice que ellos están bien con su mentado emulador
reciban un cordial saludo