[asterisk-users] SPA504G auto answer

Larry Moore lmoore at omninet.net.au
Tue Nov 4 06:28:34 CST 2014

On 23/10/2014 4:57 PM, Larry Moore wrote:
> On 23/10/2014 5:43 AM, Leandro Dardini wrote:
>> Hello,
>> I am struggling to have a SPA504G to auto answer (for intercom/paging).
>> I have tried the following SIP headers (not all together), but without
>> luck:
>> SIPAddHeader(Call-Info:\;answer-after=0);
>> SIPAddHeader(Call-Info: answer-after=0);
>> SIPAddHeader(Alert-Info: info=intercom);
>> SIPAddHeader(Alert-Info: Ring Answer);
>> SIPAddHeader(P-Auto-Answer: normal);
> What does your dialplan look like that makes the paging call?
> Listing from my Asterisk:
> '8000' => 1. Set(SIP_CODEC=alaw)
> 2. Dial(MulticastRTP/linksys/
> 3. Hangup()

In the process of setting up another system, there is an additional 
requirement for the multicast paging to work.

Asterisk will need to know where to route the multicast traffic, on your 
Asterisk system, check your routing table and see if there is a route to 
the multicast address through the interface which connects to your 
phones. If not, create a routing entry, in this case to 
through the desired interface.


More information about the asterisk-users mailing list