SpeedTouch 780 ConfigurationLast edited on Feb 25, 2012
The speedtouch 780 is a DSL modem combined with a 4 port managed switch/router, 1 FXO and 2 FXS. One great thing
about this modem is that it is possible to telnet on the device and get access to a CLI. Using the CLI, one can
achieve great things with this piece of hardware.
The specs will say that the FXO is a "Full-Mode" FXO. I don't know what they mean by that, but I was very disapointed when I used it. The FXO does not register itself with a PBX. Meaning that it is impossible to use it for placing outgoing calls or to receive calls using Asterisk (for example). You can setup a dialplan (in the device) that will allow certain numbers to be dialed directly on the FXO (i.e: 911) using the FXS ONLY! The FXO can also be used as a Fallback (for the FXS only) if registration with the PBX failed. It is then impossible to use the ST780 for PSTN access with Asterisk. For that purpose, I am using a SPA3102
This is just a sample of what I have. You will find the things I found to be the most usefull.
Before configuring this, make sure no one has a lease. In this example I am adding a pool named LAN_private. The addresses will be assigned on the interface LocalNetwork. Specifying the interface is very usefull when using several VLANs.
:dhcp server lease flush :dhcp server pool config name=LAN_private intf=LocalNetwork poolstart=192.168.1.101 poolend=192.168.1.254 gateway=192.168.1.1 leasetime=21600 primdns=192.168.1.3 secdns=192.168.1.1
This was hard to figure out. The way I am setup, I have two different VLANs. One which is the default VLAN (untagged) and the other one is tagged with ID 3. I have a Dell PowerConnect 3348 switch which has 24 port that belong in the untagged VLAN and the other 24 in VLAN3. Traffic comming from/goint to the switch for the untagged VLAN is plugged on ethernet port 1 of the st780. Traffic for VLAN 3 is also connected to ethernet port 1. The trunk comming from the switch thus transports both VLANs. I have two different DHCP pools for each VLAN so that they can be assigned different addresses in two distinct subnets.
I don't fully understand all this. All I know is that it works. I have searched everywhere and only found bits of information about that particular setup. I figured everything out by trying different stuff until it worked and trying to understand how to connect the dots between different setup I saw on other sites. Please feel free to contact me to inform me of any mistake I did here or to give me advices.
; Create vlan #3 named vlan3 :eth vlan add name=vlan3 vid=3 ;Add the OBC interface in vlan3. disabling untagging will prevent the switch from stripping ; off the tag of the incomming frame on that interface. I think that the OBC interface is the interface ; on which the router resides. If you don't add this interface in the VLAN, you won't be able to ping to router. :eth bridge vlan ifadd name=vlan3 intf=OBC untagged=disabled ;Add the ethernet port 1 in the vlan #3. We want to preserve the VLAN tag. Untagged frames will be assigned ; the default VLAN (VLAN ID 0) :eth bridge vlan ifadd name=vlan3 intf=ethport1 untagged=disabled ; Unttaged egress traffic on ethport1 will be tagged with VLAN ID "default" (0) :eth bridge ifconfig intf=ethport1 vlan=default ; Create a new ethernet logical interface :eth ifadd intf=eth_vlan3 ; frames transmitted through this interface will be tagged with vlan3 :eth ifconfig intf=eth_vlan3 dest=bridge vlan=vlan3 ;enable the interface (put it up) :eth ifattach intf=eth_vlan3 ; when using this ip interface, transmit using vlan3 logical ethernet interface. I'm not sure why I have to use the group "lan". ; if I don't use that group, it doesn't work. :ip ifadd intf=ip_vlan3 dest=eth_vlan3 group=lan :ip ifattach intf=ip_vlan3 ; when using this subnet, use vlan3 ip interface. :ip ipadd intf=ip_vlan3 addr=192.168.0.1/24 ; Add a second DHCP pool for the 2nd vlan :dhcp relay add name=relay_vlan3 :dhcp relay ifconfig intf=ip_vlan3 relay=enabled maxhops=4 trusted=disabled :dhcp relay modify name=relay_vlan3 addr =127.0.0.1 intf =ip_vlan3 giaddr =192.168.0.1
I might be wrong here, but this is the way I understand it: When a frame comes in on an ethernet interface, it VLAN ID is looked at and the frame is forwarded to every ethernet port that belongs to that VLAN. When transmitting a packet on the 192.168.0.0 subnet, the IP interface ip_vlan3 will be used. ip_vlan3 uses the logical ethernet interface eth_vlan3. When a frame is transmitted on eth_vlan3, it will be tagged with VLAN vlan3. Since ethport1 is a member of vlan3, the frame will be forwarded on it.
This is one of the easyest thing. No explanation needed here
nat mapadd intf=Internet inside_addr=192.168.0.3 inside_port=5060-5062 outside_port=5060-5062
My st780 is setup to register both FXS ports on my Asterisk PBX.
; Disable the service already provided by the device :connection appconfig application=SIP SIP_ALG=disabled :voice config digitrelay=rfc2833 rtp_portrange=10000-10100 ;FIRST: delete current profiles :voice profile add SIP_URI=username username=username password=your_password voiceport=FXS1 ; 192.168.0.2 is the address of the PBX :voice sip config useragentdomain=192.168.0.2 primproxyaddr=192.168.0.2 primregaddr=192.168.0.2 :service system modify name=VOIP_SIP state=enabled port=5060 ;allow 2000ms between each DTMF before assuming that dialing is completed. :voice fxsport config interdigitOpen=2000 interdigit=2000 ; When a call comes in on the FXO, don't forward it anywhere. You could forward it to one of the FXS, but ; not to your PBX unfortunately :voice fxoport config incfxodest=none ; the voice interface should use the ip interface ip_vlan3 :voice config intf = ip_vlan3 ; any number between 3 and 14 digits long must be forwarded to the PBX without being altered. If VOIP cannot be accessed, (PBX down, power failure, ...) use FXO :voice dialplan add prefix=0-8 defaultport=Voip fallbackport=FXO priority=Low fallback=enabled minimumdigits=3 maximumdigits=14 posofmodify=0 remnumdigits=0 rescan=no action=none ; 911 must be forwarded on the FXO directly :voice dialplan add prefix=911 defaultport=FXO fallbackport=FXO priority=High fallback=enabled minimumdigits=3 maximumdigits=3 posofmodify=0 remnumdigits=0 rescan=no action=none
The other day, my PBX was down. I noticed that every outgoing calls were automatically sent on the FXO instead of the PBX. This is the way I want it (because of the "fallback" option). The odd thing was that incomming calls were not forwarded from the FXO to the FXS. This is one thing I will have to figure out.