I am trying to use and configure your SER in a manner to let us forward our landline calls to the public sip.broadvoice.com gateway. Unfortunately, I am completely mixed up with the way it should be setup. There are some questions that I would be really appreciated if you can answer them or forward it to a right person. Please consider that I have already fully configured your SER to handle internal IP call between SIP clients and also I tested the SER with the SIP clients which are behind NAT demonstrate its NAT module works fine.

Here is my current setup parameter to access landline call:

• SER IP address: 207.34.42.53
• SER domain: ubuntu-serv.emerj.net
• SIP gateway: sip.broadvoice.com
• Internal user ID: 10002
• BroadVoice contact: 7184122016
• Number wants to access through SER:  9178462343

What I have in my MySQL server is as follow:

• Domain ubuntu-serv.emerj.net in table 'domain'.
• User 10002 registered with domain ubuntu-serv.emerj.net in table 'subscriber'. The password for this account is the normal password I set for it in database.
• User 7184122016 registered with domain sip.broadvoice.com in table 'subscriber'. The password for this account is the password has been given by BroadVoice to us.
• Defined a record in table 'usr_preferences' contains the following information:

+------+------------+--------+-----------+-----------------------------------+------+--------------------------------------------+

| uuid | username   | domain | attribute | value                                                                 | type | modified                   |

+------+------------+--------+-----------+-----------------------------------+------+--------------------------------------------+

|           | 9178462343 |                 | callfwd     | sip:7184122016@sip.broadvoice.com |    0    | 2008-08-11 10:00:29 |

+------+------------+--------+-----------+-----------------------------------+------+--------------------------------------------+

This is the information I am using for my call forwarding purpose. Whenever the user tries to dial 9178462343, this record blindly forward it to the BroadVoice.com.

Here are my questions:

1. I monitored and captured the packet between SIP, SER and BroadVoice. For the normal call directly from SIP to BroadVoice and also between SIP client and SER, a kind of SIP REGISTER message is sent at initial time and it seems that all the rest messages is based on the session value that is initially exchanged. When I try to use my SER as a call forwarding server, and when my SIP client tries to dial, SER doesn't send REGISTER message for account to 7184122016 to the BroadVoice. I want to know whether it is possible for SER to do this REGISTER before sending INVITE message for 9178462343 or not.
   

2. Is the call forwarding is the correct solution for this issue or not? Maybe there are some other things that I am not aware of them due to I am really new to SER environment.

3. I also saw that SER doesn't overwrite the values of Contact, To, and From in the INVITE message properly and everything is sent to the BroadVoice with the values of the ubuntu-serv.emerj.net as a domain and also initial SIP contact that all of them are unknown for BroadVoice gateway. How should I tell SER to overwrite this values and keeps the track of the changes?

I also attached my both ser.cfg and the logs of the SER with my email. I would be really appreciated if you assist me resolving this issue and helping me with any document or sample ser.cfg file showing me how to realize the idea.

I am looking forward to you response.