fax issues

Ray Morehead · ‎10-24-2012

Hi all,

Hoping someone can shed some light on this issue we've been having. We have a fax machine or rather several that cannot seem to fax to a particular number. I called the outside contact and was told that we are the only location that they cannot recieve a fax from. When I tried to fax to them, I hear the fax tone but it drops after 1 or 2 rings then retries a few seconds later. I've done some digging on my own and even tried some debugging but to no avail mostly because I cant make heads or tails out of the output.

Any ideas where to start troubleshooting would be appreciated...

Thanks.

Ray

Jonathan Schulenberg · ‎10-24-2012

Give us an idea of what your side of the picture looks like. What type of Cisco hardware? LAN/WAN? What's between the FXS port and the PSTN? What type of PSTN connectivity? IOS and software/firmware version? What's being used: Cisco Fax Relay/T.38 Relay/Fax Passthrough/Modem Passthrough/Modem Relay?

Ray Morehead · ‎10-26-2012

Hi Jonathan,

Sorry for the late response, here is our setup:

CCM 8.6 Publisher and Subscriber

CUC 8.6 x 2 for redundency

VG224 x 18 for analog / for patient rooms and fax machines, configured mgcp

We have a redundant PRI T1 coming in from Windstream.

I have a log from our 2 2901 routers that act as our voice gateways.

I have also wondered should we be using t.38 relay?

Thanks for your help and let me know if you need any other info.

~Ray

=~=~=~=~=~=~=~=~=~=~=~= PuTTY log 2012.10.26 13:46:00 =~=~=~=~=~=~=~=~=~=~=~=

MRH-VOICE-RTR1#sh mgcp

MGCP Admin State ACTIVE, Oper State ACTIVE - Cause Code NONE

MGCP call-agent: 10.100.4.11 2427 Initial protocol service is MGCP 0.1

MGCP validate call-agent source-ipaddr DISABLED

MGCP validate domain name DISABLED

MGCP block-newcalls DISABLED

MGCP send SGCP RSIP: forced/restart/graceful/disconnected DISABLED

MGCP quarantine mode discard/step

MGCP quarantine of persistent events is ENABLED

MGCP dtmf-relay for VoIP is SDP controlled

MGCP dtmf-relay for voAAL2 is SDP controlled

MGCP voip modem passthrough mode: NSE, codec: g711ulaw, redundancy: DISABLED,

MGCP voaal2 modem passthrough disabled

MGCP voip modem relay: Disabled

MGCP T.38 Named Signalling Event (NSE) response timer: 200

MGCP Network (IP/AAL2) Continuity Test timer: 200

MGCP 'RTP stream loss' timer disabled

MGCP request timeout 500

MGCP maximum exponential request timeout 4000

MGCP rtp unreachable timeout 1000 action notify

MGCP gateway port: 2427, MGCP maximum waiting delay 3000

MGCP restart delay 0, MGCP vad DISABLED

MGCP rtrcac DISABLED

MGCP system resource check DISABLED

MGCP xpc-codec: DISABLED, MGCP persistent hookflash: DISABLED

MGCP persistent offhook: ENABLED, MGCP persistent onhook: DISABLED

MGCP piggyback msg ENABLED, MGCP endpoint offset DISABLED

MGCP simple-sdp ENABLED

MGCP undotted-notation DISABLED

MGCP codec type g711ulaw, MGCP packetization period 20

MGCP JB threshold lwm 30, MGCP JB threshold hwm 150

MGCP LAT threshold lwm 150, MGCP LAT threshold hwm 300

MGCP PL threshold lwm 1000, MGCP PL threshold hwm 10000

MGCP CL threshold lwm 1000, MGCP CL threshold hwm 10000

MGCP playout mode is adaptive 60, 40, 1000 in msec

MGCP Fax Playout Buffer is 300 in msec

MGCP media (RTP) dscp: ef, MGCP signaling dscp: af31

MGCP default package: trunk-package

MGCP supported packages: gm-package dtmf-package trunk-package line-package

hs-package rtp-package atm-package ms-package dt-package

mo-package mt-package sst-package fxr-package pre-package

md-package

MGCP Digit Map matching order: shortest match

SGCP Digit Map matching order: always left-to-right

MGCP VoAAL2 ignore-lco-codec DISABLED

MGCP T.38 Max Fax Rate is DEFAULT

MGCP T.38 Fax is DISABLED

MGCP T.38 Fax ECM is DISABLED

MGCP T.38 Fax NSF Override is DISABLED

MGCP T.38 Fax Low Speed Redundancy: 0

MGCP T.38 Fax High Speed Redundancy: 0

MGCP Fax relay SG3-to-G3: ENABLED

MGCP Fax relay ANSam suppression: DISABLED

MGCP control bind :DISABLED

MGCP media bind :DISABLED

MGCP Upspeed payload type for G711ulaw: 0, G711alaw: 8

MGCP Dynamic payload type for Cisco fax indication: 96, Cisco fax ack: 97

MGCP Dynamic payload type for G.726-16K codec

MGCP Dynamic payload type for G.726-24K codec

MGCP Dynamic payload type for G.726-32K codec

MGCP Dynamic payload type for G.Clear codec

MGCP Dynamic payload type for NSE is 100

MGCP Dynamic payload type for NTE is 99

MGCP rsip-range is enabled for TGCP only.

MGCP Comedia role is NONE

MGCP Comedia check media source is DISABLED

MGCP Comedia SDP force is DISABLED

MGCP g729 variants use static payload type and contain annexb in SDP

MGCP Guaranteed scheduler time is DISABLED

MGCP Disconnect delay error recovery DISABLED

MGCP DNS stale threshold is 30 seconds

MRH-VOICE-RTR1#exit

Edit: I also ran a sh run on the router and we are using "modem passthrough voip mode nse"

mgcp rtp unreachable timeout 1000 action notify

mgcp modem passthrough voip mode nse

mgcp package-capability rtp-package

mgcp package-capability sst-package

mgcp package-capability pre-package

no mgcp package-capability res-package

no mgcp timer receive-rtcp

mgcp sdp simple

mgcp fax t38 inhibit

!

mgcp profile default

Ray Morehead · ‎10-29-2012

Any body?

~Ray

Kevin Monteiro · ‎10-29-2012

Hey Ray,

From what you described here is the call flow, correct me if i am wrong:

Call flow:

Faxmachine>>>FXS>>MGCP>>>CUCM>>>H323>>>GW>>PRI>>>PSTN

Fax protocol:

modem passthrough nse based.

Question's:

1> Are voice calls possible from site where you are trying to send fax from?

Can attach the following show commands:

show tech (from vg224 & voice GW)

Let me know the same.

Regards,

Kevin