[cisco-voip] fax passthrough + fax relay on same MGCP gateway (incl 6608)?

[Lelio Fulgenzi]

I've done some more reading, but I'm still confused on a few things fax. This thread is to hopefully help me understand if I can run both fax passthrough and fax relay on the same MGCP gateways, including 6608s. 

We have a site (Site B) coming on board that is currently using cisco fax relay on their gateway and on most of their VG248 ports (some VG248 ports have relay disabled). They have a 3725 running a PRI (MGCP). 

HQ (Site A) has a bank of 6608s (MGCP) and a couple of PRIs on a 3845 on a remote gateway (also MGCP). We have VG224 ports used for modems/faxes at the remote site. Everything is configured for fax passthrough and is working hunky dory. 

Is it possible to configure the HQ gateways (both 6608s and 3845 ports) to recognize both passthrough and relay? Are there problems doing this? 

I've included some relevant config info below. 



CallManager 4.1(3) -> upgrading to CUCM 7.1(3) sometime next summer. 


SITE A: 

GATEWAY (3845) [remote gateway] 

! 
boot system flash:c3845-spservicesk9-mz.124-11.T2.bin 
! 
no ccm-manager fax protocol cisco 
! 
mgcp 
mgcp call-agent 10.104.96.104 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 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 sdp simple 
mgcp fax t38 inhibit 
mgcp rtp payload-type g726r16 static 
mgcp bind control source-interface Loopback104 
mgcp bind media source-interface Loopback104 
! 

6608 (at HQ): 

Voice Calls: checked 
Modem Calls: checked 
Fax Calls: checked 

Fax Relay Enable: unchecked 
Fax Error Correction: unchecked 
Max Fax Rate: 14400 
Payload Size: 20 
Country Code: 65535 
Vendor Code: 65535 
Fax/Modem Packet Redundancy: unchecked 
NSE Type: IOS Gateway 

VG224 

! 
voice service voip 
mgcp modem passthrough voip codec g711ulaw 
! 


SITE B: 

GATEWAY: 

! 
boot system flash c3725-ipvoice-mz.123-8.T3.bin 
! 
mgcp 
mgcp call-agent 10.104.184.6 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 relay voip mode nse 
mgcp package-capability rtp-package 
mgcp package-capability sst-package 
no mgcp package-capability fxr-package 
no mgcp timer receive-rtcp 
mgcp sdp simple 
mgcp fax rate 14400 
no mgcp fax t38 ecm 
mgcp fax t38 inhibit 
no mgcp explicit hookstate 
mgcp rtp payload-type g726r16 static 
! 

VG248: 

Software version : 1.3(2) 

port specific parameters: 

---------------------------------------------------------- 
| Cisco VG248 (VGC0e38cd87ee) | 
--------------- ------------------------------------------------ ------- 
| Port selection| Port 1 parameters | | 
|---------------|------------------------------------------------|-------| 
| 1 Enabled | Status (enabled) | | 
| 2 Enabled 4| Call control mode (standard) | | 
| 3 Enabled 6| Caller ID (disabled) | | 
| 4 Enabled 6| MWI method (none) | | 
| 5 Enabled 6| VMWI variant (<country default>) | | 
| 6 Enabled 6| Call supervision method (none) | | 
| 7 Enabled 6| Input gain (0) | | 
| 8 Enabled 6| Output gain (0) | | 
| 9 Enabled 6| Dialing digit detection (default: use DSP) | | 
| 10 Disabled | Fax relay (Cisco fax relay) | | 
| 11 Disabled | Fax relay ECM (disabled) | | 
| 12 Disabled | Fax relay NSF (override with 000000) | | 
| 13 Enabled 6| Passthrough mode (default: automatic) | | 
| 14 Enabled 6 ------------------------------------------------ | 
| 15 Enabled 6282 31 Disabled 47 Disabled | 
| 16 Disabled 32 Disabled 48 Disabled | 
| '*' - port in use press 'R' to enter range | 
------------------------------------------------------------------------ 

---------------------------------------------------------- 
| Cisco VG248 (VGC0e38cd87ee) | 
-------------------------------------------------------------- 
| Advanced settings | 
|--------------------------------------------------------------| 
|^Media receive timeout (disabled) | 
| Port busy signaling (none) | 
| DTMF tone duration (default: 100ms) | 
| Echo cancelling policy (default: use SLIC) | 
| Hook flash timer (<country default>) | 
| Hook flash reject period (none) | 
| Distinctive ringing (default: no call distinction) | 
| Passthrough signaling (IOS mode) | 
| Passthrough codec (G.711 u-law) | 
| Fax relay payload size (default: 20) | 
| Fax relay maximum speed (default: 14400 bps) | 
| Fax relay playout delay (default: 300) | 
| Load control (disabled) | 
| Load control (% CPU) (0) | 
| Load control hysteresis (0) | 
-------------------------------------------------------------- 




--- 
Lelio Fulgenzi, B.A. 
Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1 
(519) 824-4120 x56354 (519) 767-1060 FAX (JNHN) 
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 
Cooking with unix is easy. You just sed it and forget it. 
- LFJ (with apologies to Mr. Popeil) 

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