Sunday, March 13, 2016

Free IVR and voicemail system for MS Lync/SFB Part 3

Welcome Back. In Part 1 and Part 2 we finished installing asterisk and configured IVR in this part we will confiugre voicemail and SFB/Lync side.

Install postfix on linux

  • First you need to remove sendmail and install postfix to make it default mail client on the voicemail server.
  • To remove snedmail run "yum remove sendmail".
  • To install postfix run "yum -y install postfix mailx cyrus-sasl-plain" .
  • You need to create a new file with name "/etc/postfix/sasl_passwd" with your mail account smtp server and credentials in the following format:
  • Then you need to hash your password file by run "postmap hash:/etc/postfix/sasl_passwd"
  • Open the /etc/postfix/ and add following lines.
smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
smtp_sasl_security_options = noanonymous
# Secure channel TLS with exact nexthop name match.
smtp_tls_security_level = secure
smtp_tls_mandatory_protocols = TLSv1
smtp_tls_mandatory_ciphers = high
smtp_tls_secure_cert_match = nexthop
smtp_tls_CAfile = /etc/pki/tls/certs/ca-bundle.crt
relayhost =
  • You could change tls confiugration according to your SMTP server.
  • Some times you will need to change the from email address in the header of sent mail so you need to create two additional files "/etc/postfix/header_checks,canonical" check this URI for more details
  • Then restart the postfix service by "service postfix restart".
  • Test sending mail by run "echo 'Test mail from voicemail system' | mail -s 'test mail' -r 'voicemail system <>'".
  • To troubleshoot you could find the logs in "/var/log/maillog"
  • Once you send the mail check your email to see if you received the email and then you can go ahead and remove the text password file by run "rm /etc/postfix/sasl_passwd".

Configure asterisk voicemail

  • first copy the voicemail sample file from sample to asterisk directory by run "cp /usr/src/asterisk*/configs/vociemail.conf.sample /etc/asterisk/voicemail.conf"
  • If you need more details on how to configure the voicemail file just read the sample file comments, but I'll go through basic needs.
  • To change from name check "fromstring="
  • To change the subject check "emailsubject="
  • To change the body check "emailbody="
  • Now we will configure the voicemail boxes by write the following under "[default]" section
user 3 digit extension=> 1234,user display name,user email address
  • repeat this line for every user you need to send him voicemail.

Configure missed call notification

  • Now let's configure the missed call notification open "/etc/asterisk/extensions.conf".
  • write following line at end of "[IVR_EN]" and "[IVR_EN]" sections.
exten => h,1,GotoIf($["${DIALSTATUS}" = "ANSWER"]?:Missed,${extens},1)
  • Write "[Missed]" in the end of the file.
  • Under "[Missed]" section write.
exten => user 3 digit extension,1,System(echo 'You have Missed Incoming Call From: ${CALLERID(num)} <${CALLERID(num)}>  Received at : ${STRFTIME(${EPOCH},,%d-%m-%Y-%H:%M:%S)}' | mail -s 'New Missed Call' -r 'voicemail system <>'  user email address)
  • Repeat this line for every user you need to send him voicemail.
  • Restart asterisk service.

Configure SIP trunks @ SFB/Lync and @ voice gateway

  • From Lync/SFB side it is similar to create SIP trunk with any gateway it was written a lot in other blog so no need to duplicate it here but to summarize you need to do the following.
    • Create SIP trunk with IVR using port 5060 at both sides.
    • Create SIP trunk with Voice gateway.
    • Route external calls to Voice gateway.
  • About voice gateway it depend upon your gateway, but you need to do the following:
    • Create sip trunk with IVR server using port 5060 for each side using TCP as transport.
    • Create sip trunk with Lync/SFB.
    • Route 299 calls to IVR system.
    • Route DID to Lync/SFB direct.
  • I'll provide in next blogs examples on how to configure most gateways which integrate with Lync/SFB.

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