03-16-2006 09:20 AM - edited 03-13-2019 12:34 PM
I am having serious problems with the following setup:
Modem -> FXS (2821, MGCP) -> Callmanager 4.1.3 -> PRI. I can't get any of my modems to connect reliably or with good speed. I have looked all over for documentation on Cisco, but so far have found very little.
I am looking for real-world solutions that have worked for others in getting this scenario working properly.
I have tried the following with no luck:
MGCP-
mgcp modem passthrough voip mode nse
mgcp modem passthrough voip redundancy
mgcp modem relay voip sprt retries 6
mgcp modem relay voip mode nse
voice-port-
disconnect-ack
no echo-cancel enable
no non-linear
timeouts call-disconnect 15
Dial-peer-
voice cut-through alert
fax rate fax
supplementary-service pass-through
Thanks in advance,
Kyle
03-22-2006 11:03 AM
command "mgcp modem passthru" to enable the gateway to send and receive modem and fax data, should able to support your requirement.
Try:
http://www.cisco.com/warp/public/788/voip/faxrelay_tsguide.html
http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121newft/121t/121t3/dtmodptr.htm
04-19-2006 09:52 PM
This is what we use for faxes and modems for our mgcp gateways with ISDN PRIs.
Faxes work fine (granted they are not the new high speed...dsp have hard time keeping up with the input feed from the higher speed faxes, will fail the fax).
As for the modem, the config will detect the modem signal and change the codec to g726r32. This works, but will intermittantly drop, sometime frequently, and/some times get junk characters sent (ex: using modem for procomm to connect to remote devices). The modem transmission might work better bumping this up to g711, but we don't want to use that much bandwidth, so half the time we end up dialing via PSTN, by passing modem VoIP dail-up.
working config - output from 3745:
mgcp
mgcp call-agent 10.192.56.10 2427 service-type mgcp version 0.1
mgcp dtmf-relay voip codec all mode out-of-band
mgcp rtp unreachable timeout 1000 action notify
mgcp modem passthrough voip mode nse
mgcp modem passthrough voip redundancy
mgcp codec g726r32 packetization-period 10
mgcp package-capability rtp-package
no mgcp package-capability res-package
mgcp package-capability sst-package
no mgcp package-capability fxr-package
mgcp package-capability pre-package
no mgcp timer receive-rtcp
mgcp timer nse-response t38 500
mgcp sdp simple
mgcp fax t38 inhibit
mgcp fax t38 gateway force
mgcp rtp payload-type g726r16 static
mgcp rtp payload-type clear-channel static
!
mgcp profile default
!
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