ATA 186 auto registration

To disable auto registration for any of the port set Sid 0 or Sid1 to 0 or empty. This will disable the port and not attempt a registration with CM. If you want to manually add the port in CM, put Sid0 or Sid1 as the mac-address of the appropriate port.

MGCP & H323 IOS gateway and T38 faxing

MGCP gateways and T38 

1. mgcp fax t38 ls_redundancy 0  OR

    mgcp fax t38 hs_redundancy 0

ls_redundancy set to 0 disables mgcp from sending redundant packets. The value can be set from  0  – 5 or 7 packets

hs_redundancy set to 0 disables mgcp from sending redundant packets for high speed fax m/c v.17, v27, v29 T.4 or T.6 fax machine. Default is 0, Can be configured up to 2 or 3.  0 disables redundancy.

Optional commands:

mgcp fax t38 gateway force  – This command forcest38 fax relay using NSE's eve if T38 and NSE's cannot be negotiated by the MGCP call agent at call setup time

mgcp fax t38 inhibit - Disables MGCP T38 fax relay.

mgcp tse payload <value>  - TSE is for Telephony signalling event. This command specifies payload value during fax and modem passthrough. Default is 100.

mgcp fax rate <rate>|voice  (Default rate is 7200 bps)

H323 gateways and T38

dial-peer voice 1 voip

fax rate voice

fax protocol t38 ls_redundancy 0

options available are : 

force - forces use of NSE;s to switch to T38 fax relay

fallback pass-through  g711ulaw | g711alaw - A fallback mode if T38 could not be negotiated.

MGCP IOS gateway and ATA 186 in H323 mode – Fax Passthrough configuration

1. Configure MGCP gateway as usual (with FXS ports).

2. Give the following commands

     no ccm-manager fax protocol   — disables cisco fax relay

     mgcp modem passthrough voip mode nse  — enables modem passthrough

     mgcp modem passthrough voip codec g711ulaw

MGCP default NSE payload types

Output of "Sh mgcp"

MGCP media bind ISABLED
MGCP Upspeed payload type for G711ulaw: 0,  G711alaw: 8 (You may opt to match this up with ATA NSE payload type)
MGCP Dynamic payload type for G.726-16K codec
MGCP Dynamic payload type for G.726-24K codec

3. Optionally you may want to disable T38 fax relay for MGCP (which is enabled by default)

mgcp fax t38 inhibit. (Useful if you want to just have passthrough enabled, and disable t38 fax on the gateway)

ATA 186 Fax modes (H323)

Fax pass through – Set audio mode to 0×00150015

Fax mode – (Use direct g711 only, it doesn't do any codec upspeed.) – Set audiomode to 0×00120012

12 – corresponds to 0001 0010

bit 1 – set to 1 for g711 only

bit 2 – set to 0 to disable CED

DSCP settings for H323 and MGCP gateways

The setting below applies to packets generated by teh router itself.

For H323 gateways

Default for signaling is af31 (26). Need to change this to cs3 (24).

dial-peer voice 1500 voip
ip qos dscp cs3 signaling 

For MGCP gateways

mgcp ip qos dscp cs3 signaling

IOS gateways – faxing – three steps

To enable fax passthrough in a H323 IOS gateway: (This can be given under a dial peer or globally under voice service voip mode)

Global mode:

1.  modem passthrough nse [payload-type number] codec {g711ulaw|g711alaw} [redundancy] [maximum-sessions <value>]

* Payload-type default : 100 for IOS gateways (Set this to same for all other gateways)

* Codec should be g711ulaw for fax sent over a t1 trunk or g711alaw for fax sent over a e1 trunk

* redundancy – enables fax redundancy. Set this parameter to be same at both ends

* max sessions – defines how many fax calls can occur simultaneously. Default is 16. Valid values 1 – 26.

2. Disable Fax relay – Fax relay is enabled by default and takes precedence over Passthrough.

fax rate disable

3. If you gave the modem passthrough setting under voice service voip mode, then you need to give the following command in dial-peer mode.

dial-peer voice 1 voip

modem passthrough system

Dial-peer mode: (2 steps)

 If you choose not to apply the modem passthrough settings in global mode, dial-peer voice 1 voip

fax rate disable

modem passthrough nse codec g711ulaw

To enable Fax passthrough in a Cisco IOS MGCP gateway

no ccm-manager fax protocol cisco

mgcp modem passthrough voip mode nse

mgcp modem passthrough voip codec g711ulaw|g711alaw.

H323 – ATA fax passthrough setting – recommendations

Audiomode - 0×00150015

0000 0000 0001 0101 (last 4 hex digits represents phone 1)

Bit 0 – 1 enables VAD

Bit 2 – 1 enables fax CED tone detection

Connect mode : 0×90000400

1001 0000 0000 0000 0000 0100 0000 0000

Bits 12 – 8 represent NSE payload type offset. Default NSE payload type is 100 for ATA which means the offset is set to 4 (00100). IOS H323/SIP gateways use NSE payload type 100. Most MGCP gateways using 6608 uses NSE payload type 101. So set the offset to 5 (00101) if setting up fax between ATA and 6608 (older versions)

Bits 13 – default 0 – represents fax pass through codec. 0 means g711ulaw, 1 means g711alaw.

To use fax in countries other than US, set

Connect mode : 0×90002400
**** key things to remember about interoperability of various AVVID fax components******

If a VG248, Cisco IOS router, MGCP gateway and ATA 186 is involved in faxing. Then set the NSE payload type to 100 (IOS Mode) in all devices. In VG248 set to IOS mode. In router by default NSE payload type is 100 (for modem passthrough). In MGCP IOS gateway (need to check). In 6608 set the mode to IOS mode. In ATA 186, default NSE payload type is 96 + offset of 4 = 100.

Fax passthrough – unlimited!!

What is Fax passthrough ?

Fax passthrough encodes fax traffic with in a g711 voice codec and sends it across the voip network as a voice call. The call may use any codec (g711, g729, g723) etc initially and once a 2100 Hz CED tone is detected, the device (ATA for ex:) tells the far end gateway to switch over to G711 using a peer-to-peer message. This message is called a NSE message (Named Signalling Event) with in the RTP stream.

ATA 186 H323 Audio parameters

LBRCodec:

If LBRCodec is set to 0, ATA chooses g723.1 as the Low bit rate codec. (You can have up to 2 calls on the ATA at g723.1)

If LBRCodec is set to 3, ATA chooses g729 as the Low bir rate codec (Only one call can be there on the ATA at g729). The allocation of g729 to either ports is dynamic. (Unlike SCCP, where the Connect mode bit 21 determines which port will use g729)

Audiomode 

Audiomode has 32 bits. First 16 bits set parameters for Phone port 1, Upper 16 bits set parameters for Phone port 2.

Default : 0×00150015

0000 0000 0001 0101 0000 0000 0001 0101

Bit 0 and 16 – Disable VAD (0 – Disable, 1 – Enable)

Bit 1 and 17 – if set to 1, enable g711 only. If set to 0 Enable LBR along with g711.

Bit 2 and 18 – if set to 1 enables fax CED tone detection

TxCodec:

To specify transmit audio codec preference

0 – g723 (only if LBRCodec is 0)

1 – g711alaw

2 – g711ulaw

3 – g729a (only if LBRCodec is 3)

RxCodec

0 – g723 (only if LBRCodec is 0)

1 – g711alaw

2 – g711ulaw

3 – g729a (only if LBRCodec is 3)

Networking ATA, Callmanager and Voice gateway with FXS (phones)

Setup :

a. Callmanager 4.1 with IP phone extension 1005 (Callmanager IP 192.168.1.200)

b. ATA 186 with H323 load , 2 phones with extension 2000, 2001 (ATA IP 192.168.1.46)

c. H323 gateway with FXS ports with phone extension 3010, 3011 (Gateway IP 192.168.1.202)

d. Gatekeeper with 3 zones created (one for CM, one for gateway and one for ATA) (GK IP 192.168.1.201)

******Key things to note about GK registration*******

 a. ATA register with GK as Terminal

 b. H323 gateway registers with GK as Voip-GW

 c. Callmanager can be registered to the GK as Voip-GW or Terminal (Trunk configuration page)

 d. GK uses proxying between Terminals and Voip-GW's. So take special note to disable proxy from each zone that involes a Terminal and Voip-GW.

Configuration of ATA

a. Use E164 numbers in UID0 and UID1.

b. No need to set Login ID's if using E.164 numbers for GK registration

c. Specify the GKID field with the zone name (with out domain name)

d. Specify the GKOrProxy field with the IP address of the gatekeeper (192.168.1.201)

e. ATA cannot specify a tech prefix (as it registers as a terminal)

Configuration of GK

 

GateKeeper#sh gatek end
                    GATEKEEPER ENDPOINT REGISTRATION
                    ================================
CallSignalAddr  Port  RASSignalAddr   Port  Zone Name         Type    F
————— —– ————— —– ———         —-    –
192.168.1.46    1721  192.168.1.46    1739  ATA               TERM
    ENDPOINT ID: 8232D55C00000001  VERSION: 2 age= 233 secs
    E164-ID: 2001
192.168.1.46    1720  192.168.1.46    1719  ATA               TERM
    ENDPOINT ID: 82609CF000000002  VERSION: 2 age= 233 secs
    E164-ID: 2000
192.168.1.200   55419 192.168.1.200   53824 CM41              VOIP-GW
    ENDPOINT ID: 824FC0F400000004  VERSION: 2 age= 18 secs
    H323-ID: CCM_1
192.168.1.202   1720  192.168.1.202   50439 gateway           VOIP-GW
    ENDPOINT ID: 8230A09400000004  VERSION: 2 age= 40 secs
    H323-ID: 192.168.1.202
    E164-ID: 3011
    E164-ID: 3010
Total number of active registrations = 4

GateKeeper#

Gateway Configuration

interface Ethernet0/0
 ip address 192.168.1.202 255.255.255.0
 half-duplex
 h323-gateway voip interface
 h323-gateway voip id gateway ipaddr 192.168.1.201 1719
 h323-gateway voip h323-id Gateway
 h323-gateway voip tech-prefix 1#

dial-peer voice 1 pots
 destination-pattern 3010  —– phone 1
 port 1/0/0
!

dial-peer voice 2 pots
 destination-pattern 3011  —– phone 2
 port 1/0/1

dial-peer voice 10 voip
 destination-pattern 1…      —— Pattern for calls to Callmanager , No need to prepend tech prefix as 4# is  default tech prefix

 session target ras
 dtmf-relay h245-alphanumeric
 codec g711ulaw
 
!
dial-peer voice 10 voip
 destination-pattern 2…     ——- Pattern for Calls to ATA, No need for tech prefix as ATA registers to GK as terminal
 session target ras
 dtmf-relay h245-alphanumeric
 codec g711ulaw
! 

gateway

Configuration of Callmanager

a. Add a gatekeeper (with GK's ip address, 192.168.1.201)

b. Add a Trunk (Gatekeeper controlled) and specify tech prefix 4#, the gatekeeper that was previously added, Terminal type (VOIP-GW or Terminal)  and zone name (CM41)

c. Set the significant digits on incoming calls to All.

d. Add a route pattern [23]XXX and route the calls through the trunk created in step 2. 2XXX is for ATA phones and 3XXX is for FXS phones

Basic H323 parameters – ATA in H323 mode

UID 0 – E.164 number of port 1, UID 1 - E.164 number of port 2. This is effective only if UseLoginID = 0.

LoginID 0 – H323 ID of port 1, LogingiD1 – H323 ID of port 2. This is effective only if UseLoginID = 1 (default 0)

ATA 186 SCCP config page reference

If the pic is not legible, download the picture and zoom it to see more clearly.

How to reset ATA 186 to factory defaults

1. Pickup phone handset and press ATA function button

2. Dial FACTRESET#. The IVR will say press * to save or to exit press # key. Press * to save and it should reset the ATA to factory default configuration.

TOS bit setting (SCCP)

Default value :0×000068b8

 0110 1000 1011 1000 (ignoring leading 0's)

 0-7 digits represents RTP payload. Maps to DSCP 46 or TOS 5 (leading 3 digits 011)

8 – 15 digits represents Voice signalling. Maps to DSCP 26 or TOS 3 (leading 3 digits are 101)

To change the voice signalling to DSCP 24 (according to CM 4.1 specs) the new value of TOS is

0×000060b8     (Change bit 11)

Audiomode settings for ATA (SCCP)

Default value : 0×00350035

 32 bit field, first 16 bits for phone 1 and second 16 bits for phone 2 (starting from LSB)

0000 0000 0011 0101    0000 0000 0011 0101

 a. To force g711 on all calls set bit 1 and 17 to 1 – Audiomode becomes 0×00370037  (Both ports are forced to use g711)

 b. To use low bit rate codec or g711 (default setting) – set bits 1 and 17 to 0 – Audiomode becomes 0×003500035

Fax CED tone detection

Bits 2 and 18 should be set to 1 (default) to enable Fax CED tone detection

If set to 0, tone detection is disabled.

Fax between ATA on port 2 and Router with FXS (g729 codec)

Fax setup that works:

Fax on port 2 of ATA, LBRcodec = 3, Connect mode bit 21 = 1.

Router has dial-peer with g729r8 (br8) codec and fax machine on FXS port.

Commands in dial-peer:

dial-peer voice 10 voip

codec g729r8|br8

modem passthrough nse codec g711ulaw

fax rate disable

fax protocol pass-through g711ulaw

Fax setup that didnt work

Fax on port 2 of ATA, LBRcodec = 3, Connect mode bit 21 = 1.

Router has dial-peer with g729r8 (br8) codec and fax machine on FXS port.

Commands in dial-peer:

dial-peer voice 10 voip

codec g729r8|br8

fax rate disable

fax protocol pass-through g711ulaw

Conclusion : With out modem passthrough, Fax passthrough on routers are not working!

LBRCodec and Connect Mode (Skinny)

LBRCodec can take 2 values 0 or 3.

ATA can support following codec. g723, g729, g729a, g711(a/u).

Both ports can support g723 at same time

Both ports can support g711 at same time

Only one port can support g729 at any time.

Port 2 doesnt have support for g729a. Port 1 has.

When LBRCodec = 0,

port 1 and 2 can use g711ulaw, g711alawor g723.1

When LBRCodec =3 and Connect mode  bit 21 = 0 (affects only g729)

Port 1 can use g711ulaw, g711alaw, g729a or g729

When LBRCodec=3 and Connect mode bit 21 = 1 (affects only g729)

Port 2 can use g711ulaw, g711alaw, g729

ATA SID (Sccp)

ATA 186 SID 0 is for phone port 1

ATA 186 SID 1 is for phone port 2

If set to 0, phone port is disabled and doesnt register with CCM.

If set to . (dot), ATA port uses its default mac-address (port 2 uses 01 appended at the end) to register with CCM

ATA 186 -setting static Vlan ID in ATA (SCCP)

You will have to use OpFlag and Vlan setting fields.

Opflag:

Default value of OpFlag is 0×000000002

0000 0000 0000 0000 0000 0000 0000 0010  — bits 4,5,6 are set to zero by default which acquires VLAN ID via CDP. To disable this setting and set this to static, use 101 in bits 4,5,6

0000 0000 0000 0000 0000 0000 0101 0010  — 0×00000052

VLAN Setting:

Default setting is 0×0000002b

Translates to 0000 0000 0000 0000 0000 0000 0010 1011 

Set bits 18 through 29 with VLAN ID. IF you have to set VLAN ID to 115, 115 translate to

64 + 32 + 16 + 0 + 0 + 2 + 1 = 01110011

0000 0001 1100 1100 0000 0000 0010 1011 

which translate to 0×01cc002b

Cos bits for Signalling and RTP ( first 6 bits of Vlan setting)

0000 0001 1100 1100 0000 0000 0010 1011

First three bits (0-2) are for voice signalling. By default this is set to 3.

0000 0001 1100 1100 0000 0000 0010 1011 

Second three bits (3-5) are for voice bearer (rtp). By default this is set to 5.

ATA 186 basics

1. To add ATA 186 port 1 enter the mac-address of ata 186

2. To add ATA 186 port 2 drop leading 2 digits of mac-address and add a 01 to the end.

3. To enable DHCP via phone, hit the red menu button on ATA and choose option 20# and choose 0 for disable dhcp, 1 for enable dhcp

4. To configure IP address via phone chooose option 1#. Separate dots with *

5. To configure default router choose option 2#. Separate dots with *

6. To configure subnet mask choose option 10# Separate dots with *.

VG248 Passthrough signalling

You can set passthrough signalling mode to

 a. Legacy – Use with older VG248 software which runs only Legacy mode or with 6608 with older firmware or 6624-FXS

 b. IOS mode – Use with ATA 186, 6608 with new firmware (new CM versions), all Cisco IOS routers or another VG248 with new software (1.2 or 1.3)

Fax key notes.

Fax key notes:

a. ata supports only fax passthrough (h323,mgcp or sccp)
b. 6608 supports cisco fax relay and passthrough. No support for t38.
c. ios gateways support all modes passthrough, relay, t38 (fxs)
d. vg248 supports all modes (passthrough, relay and t38). T.38 is available only on version 1.3(1)

VG248 Call Control Modes

a. standard – no need to use feature codes…features available are similar to feature mode.
b. feature – use feature codes for transfer and conference and other phone features. Use hookflash and feature code at the end to perform the operation (xfer, conf etc). With feature mode, there is independent control of each call leg.
c. basic – no transfer/conf. good for fax and modems
d. restricted  – most limited call mode. Used with billing system that begins charging when calls connect.

To change call control mode, go to each port, port specific parameters and enable the mode. default is standard.