Maybe a SIP/RTP problem?

General Help
1

I have FreePBX 2.1.3 installed at a real estate office. We are using Cbeyond SIPConnect with 16 channels for telephone service. We would like to forward all after hours inbound calls to an outside cell phone, so the call will come in on one of the SIP channels and out on another.

If we do a call transfer, where the inbound call is taken by a receptionist then trasferred out to the cell phone, everything works. However if we set all calls to do a call forward to the cell phone, the cell phone rings from an incoming call, but whe answered, there is no audio in either direction.

With some testing, we have found that if the call originates from inside the company and is forwarded to the outside cellphone, audio works perfectly. It is just when an outside call is forwarded through asterisk to another outside phone that we have no audio.

Anyone have any ideas how to get audio between the two outside calls on a call forward?

2

Just for clarification, how does SIPConnect ‘connect’ to your ‘*’ server,

  • SIP Channel ‘behind’ your firewall (terminated on your LAN)
  • SIP Channel ‘outside’ your firewall (via the Internet or on the WAN)

Brian

-----Original Message-----
From: hcrane [mailto:[email protected]]
Sent: Monday, November 27, 2006 7:46 AM
To: [email protected]
Subject: [Amportal-users] Maybe a SIP/RTP problem?

I have FreePBX 2.1.3 installed at a real estate office. We are using Cbeyond
SIPConnect with 16 channels for telephone service. We would like to forward
all after hours inbound calls to an outside cell phone, so the call will
come in on one of the SIP channels and out on another.

If we do a call transfer, where the inbound call is taken by a receptionist
then trasferred out to the cell phone, everything works. However if we set
all calls to do a call forward to the cell phone, the cell phone rings from
an incoming call, but whe answered, there is no audio in either direction.

With some testing, we have found that if the call originates from inside the
company and is forwarded to the outside cellphone, audio works perfectly.
It is just when an outside call is forwarded through asterisk to another
outside phone that we have no audio.

Anyone have any ideas how to get audio between the two outside calls on a
call forward?

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3

Sorry, I should have stated that…

SIP Channels are outside the firewall via a WAN connection. The router is natting them in to the * box which is sitting at 192.168.110.21. I do have the proper externip, externrefresh and localnet entries in SIP.CONF. I also have the router forwarding UTP ports 5004-5082 and 10001-20000 to the * box.

4

I’ve had problems when editing “sip.conf”. Have you tried adding those
lines to “sip_nat.conf”?

Brian

-----Original Message-----
From: hcrane [mailto:[email protected]]
Sent: Monday, November 27, 2006 9:33 AM
To: [email protected]
Subject: Re: [Amportal-users] Maybe a SIP/RTP problem?

Sorry, I should have stated that…

SIP Channels are outside the firewall via a WAN connection. The router is
natting them in to the * box which is sitting at 192.168.110.21. I do have
the proper externip, externrefresh and localnet entries in SIP.CONF. I also
have the router forwarding UTP ports 5004-5082 and 10001-20000 to the *
box.

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opinions on IT & business topics through brief surveys - and earn cash
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Amportal-users mailing list
[email protected]
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5

No. I can try that tonight.