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Voice, Provisioning:
Provision Enable = yes
Profile Rule: http://config.broadvoice.com:8080/$MA.cfg

Voice, Line 1:
Proxy and Registration…
Proxy:	sip.broadvoice.com
Outbound Proxy: proxy-nyc.broadvoice.com
Use Outbound Proxy = yes
Use OB Proxy In Dialog = yes
Register = yes
Register Expires = 600 from 3600
Use DNS SRV = yes
DNS SRV Auto Prefix = yes
Proxy Failback Intvl = 600 from 1800

Subscriber Information…
Display Name = blank
User ID = 2125551212
Password = PASSWORD
Ue Auth ID = yes
Auth ID = 2125551212

Audio Configuration…
Preferred Codec = G711u
Second Preferred Codec = Unspecified
Third Preferred Codec = Unspecified
Use Pref Codec Only = yes

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Router, Wan Setup:
Enable WAN Web Server = yes

SIP:
SIP Parameters…
Mark All AVT Packets = yes

SIP Timer Values (sec)…
Reg Max Expires = 600 from 7200
Reg Retry Intvl = 10 from 30
Reg Retry Long Intvl = 20 from 1200

RTP Parameters…
Stats in BYE = yes

SDP Payload Types…
RTP-Start-Loopback Codec = G711u

Voice, Line 2:
Line Enable = no

Voice, Line 1:
Network Settings…
Network Jitter Level = extremely high
Jitter Buffer Adjustment = up and down

NAT Settings…
NAT Mapping Enable = yes
NAT Keep Alive Enable = yes

Audio Configuration…
Preferred Codec = G711u
Second Preferred Codec = Unspecified
Third Preferred Codec = Unspecified
Use Pref Codec Only = yes

*** Fax machine tuning ***
Echo Canc Enable = no
Echo Canc Adapt Enable = no
Echo Supp Enable = no
FAX CED Detect Enable = yes
FAX CNG Detect Enable = yes
FAX Passthru Codec = G711u
FAX Codec Symmetric = yes
DTMF Process AVT = no
DTMF Tx Method: InBand
FAX Passthru Method = NSE
FAX Process NSE = yes
FAX Disable ECAN = yes
FAX Enable T38 = yes
FAX T38 Redundancy = 1 (set higher if you are having problems with Fax transmissions)
FAX Tone Detect Mode = caller or callee

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Soft reset…
* 6 settings

Debug…
telnet to device
debug sip-messages
tty mon 0

Status…
show status
W351 unprovisioned proxy_emergency
W350 unprovisioned proxy_backup

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My fax to email solution achieves the following:
Receive faxes using a traditional phone number using VoIP
Email the received faxes in PDF format to any email address

Software used:

• VMware ESXi
• trixbox v2.6.2.3

Services:

• BroadVoice SIP for VoIP

After trixbox is installed. Follow the guide below to setup the fax server.

Login in as maint/password.
1. PBX
2. PBX Settings
3. General Settings
4. General Settings/Fax Machine
Extension of fax machine for receiving faxes: system
Email address to have faxes emailed to: email@domain.com
Email address that faxes appear to come from: another_email@domain.com
5. Submit Changes
6. Inbound Routes
7. Inbound Routes/Add Incoming Route
DID Number:
8. Inbound Routes/Fax Handling
Fax Extension: system
Fax Email: fax-group@domain.com
Fax Detection Type: NVFax
Pause After Answer: 10
9. Inbound Routes/Set Destination
Terminate Call: Hangup
10. Submit
11. Add the following two lines to /etc/asterisk/extensions_custom.conf
[ext-did-custom]
exten => fax,1,Goto(ext-fax,in_fax,1)
12. Apply Configuration Changes