15 Apr
2005
15 Apr
'05
12:01 p.m.
I am installing a SIP proxy in a Linux machine in the local network of my
office. I have implemented a SIP proxy with SER. The function of the SIP
proxy is to let the users talk each other without knowing the IP where each
one is reachable. My problem appears when the caller wants to cancel the
call because the callee does not answer. Since I want the calle's phone to
stop ringing, and I haven't received a final response, the caller's phone
has to send a CANCEL request. When the proxy server receives the CANCEL, it
replies with a 487 "Request cancelled". SER does this before forwarding the
CANCEL to the callee's phone. These 487 response generated by SER makes the
INVITE client transaction of the caller finish. When the INVITE server
transaction finishes in the callee's phone, it sends another 487 response,
which is forwarded by SER, but the caller's transaction is already
finished, so it doesn't receive the corresponding ACK.
I would like to know how to solve this problem, since SER should wait for
the callee's phone to send the 487 and then forward this response to the
caller's phone.
Best regards,
Esteban.
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Esteban Monturus de Carandini (mailto:emonturus@teltronic.es)
Enhanced Wireless Solutions (EWS Project)
TELTRONIC, S.A.U.
Parque Tecnologico Walqa
Edificio Uno
Ctra Zaragoza N-330a, Km 556
22197 Cuarte (Huesca) - Spain
Phone/Fax: +34 974 215018
http://www.teltronic.es
http://ptwalqa.com
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