[asterisk-ss7] chan_ss7 experience and question.

[Vernier Umali]

I have recently integrated with a switch using chan_ss7 0.90. Calls
were passing thru from IAX to ss7 and voice quality is excellent. I
haven't done calls from ss7 to IAX since they have to change something
at the switch (routing). I have a few observations though.

1. When I use IAX to call ss7 and I send a busy tone from the mobile,
the channel would still indicate initializing calls. But when I call
the phone from IAX and pick up the fone then cancelled the call from
the phone, everything turned out ok. I got these from the logs when I
sent the busy tone.

DEBUG[28643] l4isup.c: processing ISUP message, typ=CPR, CIC=24
DEBUG[28643] l4isup.c: Process CPR, CIC=24 event=0x3, obci=0x1

2. I'm getting a few CRC and bitstream errors from the logs. I'm also
getting a few IRQ misses. I think this is because of IRQ sharing. I
intend to fix that next time and see what happens. But as I said,
calls a coming through OK. Logs of the errors

mtp.c: MTP2 bitstream frame format error, entering octet counting mode
on link 'l1'.
mtp.c: MTP2 CRC error (CRC=0x9496 != 0xf0b8) on link 'l1'.

Besides the above, everything seems to be going ok. I haven't really
tested it yet on long and many calls and I haven't done ss7 to ip
calling yet. I'm also keen on ss7 to ss7 calls passing though
asterisk.