Voicemail notification not working behind ASA5505

Unanswered Question
Jun 23rd, 2010

I have a problem that makes no sense.  I have a UC520 that was installed earlier this week and the voicemail to email notification to email is not working.  I am using my ISP's SMTP server for the Voicemail notification for the UC520 to send out the notification message.  The server requires no username or password.  I set up my PC to send email using this server and it works fine.  When the ASA tries to get create the connection for the uc520 i get this in the log on the asa
Teardown TCP connection 230 for outside:66.109.172.25/25 to inside:10.1.10.1/46312 duration 0:00:30 bytes 0 SYN Timeout
why in the world would the ASA allow smtp traffic out the smtp server from a PC so easily but fubar the connection from the uc520?
here is what the network looks like
INTERNET
   |
ASA - DMZ
    |
192.168.0.0 INSIDE network
    |
192.168.0.x
UC520
10.1.10.1 Callmanager/Unity Express

    |


any input is appreciated Thanks a ton!

I have this problem too.
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bmhoskinson Wed, 06/23/2010 - 07:34

Here is the other funny thing I had an old linkysy soho router with default configuration on it I swapped the ASA out for to test and the email notification goes out no problem so either the linksys is smarter than the ASA or or because it isnt as smart it has no problem just sending the message on.

bmhoskinson Wed, 06/23/2010 - 13:05

I got it figured out.  On the ASA 5505 adding the following commands allow the SMTP message from the UC 520 to pass to an SMTP server on the web and deliver the voicemail notification.

nat (inside) 1 10.1.10.0 255.255.255.0

route inside 10.1.10.0 255.255.255.252 192.168.0.15 1

Thanks to the guys at Alpha Technologies for helping me figure it out.

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