have scenario where we are looking to leverage vg224 for fax and modem.
for the most part i've steered customers away from using these devices due to issues experienced in past and just recently looking through some of the threads here there seems to be lots of headache with getting this going.
Have basic cucm with ISR with PRI to PSTN and customer wants to use vg224 for fax and modem.
can anyone give some past experiences as to if this is worth it or not and if it works consistantly or not.
It depends on the level of control you're comfortable with. If I was to have a gateway, I would probably use H323 or MGCP. There are too many cases where Callmanager is on the fritz, and the PRI is doing weird things causing external calls to fail. I like having the separation of function between the gateway and CUCM. That's because I work with them all day, and I'm very comfortable with them. If I didn't I may lean towards MGCP so that CUCM would 'take care of it'.
There are certain things you can't do with MGCP:
1) cause code mapping
2) translations on the gateway
3) DTMF control
4) partial PRIs
5) CUBE (if you move to a SIP trunk)
6) divert certain calls away from CUCM
7) control ISDN on the router
8) More general 'control' functions
In this case, faxing and modems are pretty equivalent between H323 and MGCP.
One thing that MGCP gateways cannot do is fax pass-through.
One limitation of the modem relay configuration is the lack of V.90 and V.92 support (speeds above 33.6). It shouldn't be a problem with modem passthrough. If you don't care about bandwidth conservation, this isn't an issue.
The major concern is if you have voice quality problems in your network. If you have the smallest voice quality problem, it will stop a modem/fax call surprisingly quick.
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