Hello <br><br>I'm asking for help with this issue.<br><br>I have an asterisk box, connected to a legacy PBX through 2 E1 R2. Almost everything is ok.<br>I have noticed that when a call goes to an available extension, the call is established without problem. But when a call goes to a busy extension, i see an error on my asterisk cli. This is the error:<br>
<br>[Aug 29 18:30:42] ERROR[4950] chan_dahdi.c: Chan 2 - Protocol error.
Reason = Invalid Multi Frequency Tone, R2 State = Seize ACK Received, MF
state = Category Transmitted, MF Group = Forward Group II, CAS = 0x0C<br>DNIS = 4125, ANI = 25581838, MF = 0x31<br><br><br><br>Now, This is the las part of the call log of a dropped call, I think the highlighted line is the one I'm having problems with.<br>
<br>[Aug 29 18:30:42] DEBUG[4950] chan_dahdi.c: Chan 2 - Sending more ANI unavailable<br>[Aug 29 18:30:42] DEBUG[4950] chan_dahdi.c: Chan 2 - MF Tx >> F [ON]<br>[Aug 29 18:30:42] DEBUG[4950] chan_dahdi.c: Chan 2 - MF Rx << 3 [ON]<br>
[Aug 29 18:30:42] DEBUG[4950] chan_dahdi.c: Chan 2 - MF Tx >> F [OFF]<br>[Aug 29 18:30:42] DEBUG[4950] chan_dahdi.c: Chan 2 - MF Rx << 3 [OFF]<br>[Aug 29 18:30:42] DEBUG[4950] chan_dahdi.c: Chan 2 - Sending category National Subscriber<br>
[Aug 29 18:30:42] DEBUG[4950] chan_dahdi.c: Chan 2 - MF Tx >> 1 [ON]<br><span style="background-color:rgb(255, 255, 51)">[Aug 29 18:30:42] DEBUG[4950] chan_dahdi.c: Chan 2 - MF Rx << 1 [ON]</span><br>[Aug 29 18:30:42] DEBUG[4950] chan_dahdi.c: Chan 2 - MF Tx >> 1 [OFF]<br>
[Aug 29 18:30:42] DEBUG[4950] chan_dahdi.c: Chan 2 - MF Rx << 1 [OFF]<br>[Aug 29 18:30:42] ERROR[4950] chan_dahdi.c: Chan 2 - Protocol error. Reason = Invalid Multi Frequency Tone, R2 State = Seize ACK Received, MF state = Category Transmitted, MF Group = Forward Group II, CAS = 0x0C<br>
DNIS = 4125, ANI = 25581838, MF = 0x31<br><br><br><br>Now this is the last part of a call log where everything is ok.<br><br>[Aug 29 18:32:39] DEBUG[4959] chan_dahdi.c: Chan 6 - Sending more ANI unavailable<br>[Aug 29 18:32:39] DEBUG[4959] chan_dahdi.c: Chan 6 - MF Tx >> F [ON]<br>
[Aug 29 18:32:39] DEBUG[4959] chan_dahdi.c: Chan 6 - MF Rx << 3 [ON]<br>[Aug 29 18:32:39] DEBUG[4959] chan_dahdi.c: Chan 6 - MF Tx >> F [OFF]<br>[Aug 29 18:32:39] DEBUG[4959] chan_dahdi.c: Chan 6 - MF Rx << 3 [OFF]<br>
[Aug 29 18:32:39] DEBUG[4959] chan_dahdi.c: Chan 6 - Sending category National Subscriber<br>[Aug 29 18:32:39] DEBUG[4959] chan_dahdi.c: Chan 6 - MF Tx >> 1 [ON]<br><span style="background-color:rgb(255, 255, 51)">[Aug 29 18:32:39] DEBUG[4959] chan_dahdi.c: Chan 6 - MF Rx << 6 [ON]</span><br>
[Aug 29 18:32:39] DEBUG[4959] chan_dahdi.c: Chan 6 - MF Tx >> 1 [OFF]<br>[Aug 29 18:32:39] DEBUG[4959] chan_dahdi.c: Chan 6 - MF Rx << 6 [OFF]<br>[Aug 29 18:32:39] WARNING[4959] chan_dahdi.c: Unable to enable echo cancellation on channel 6 (No such device)<br>
[Aug 29 18:32:39] VERBOSE[4959] chan_dahdi.c: MFC/R2 call has been accepted on forward channel 6<br>[Aug 29 18:32:39] VERBOSE[4959] app_dial.c: -- DAHDI/6-1 is ringing<br><br><br>I don't know if the highlighted lines refer to gorup B Backward signals (B1 and B6), the thing is that when I receive a B1 the call gets dropped, and I don't know which parameter adjust to solve this issue.<br>
<br>Thanks in advance <br><br><br clear="all"><br>-- <br><div>Juan Pablo Villarreal<br>Ingeniero Electrónico<br>email: <a href="mailto:jvillarreal@opengroupsa.com" target="_blank">jvillarreal@opengroupsa.com</a><br>Santiago de Cali<br>
</div>Colombia<br>