Please send us all SIP messages (not just the ack) and also debugging output of ser.

Jan.

On 29-04 16:45, markus monka wrote:

It is a ZyXEL Phone connected to a ZyXEL Wlan Router.

Sending INVITE

INVITE => SER => ASTERISK

ASTERISK send "Session Progress" everything is fine: ASTERISK sends "OK"

Session starts. I can hear my Voice. After 6 Seconds Session breaks up.

Something seems to be strange with the ACK the ZyXEL Phones sends:

PHONE => PROXY ACK sip:0xxxxx@21.1.7.9 SIP/2.0 Via:SIP/2.0/UDP 21.28.17.18:5060;branch=z9hGddbkb8a7ca191bf4fd From:Zyxelsip:1111111@domain.de;user=phone;tag=C2E2D6CF845EA11AEBC2 To:sip:0xxxxxxxxx@domain.de;user=phone;tag=as4f89971f Call-ID:15482-E655-54C3-B488-1D32D8DF7653@21.28.17.18 CSeq:1 ACK User-Agent: ZyXEL P2000W VoIP Wi-Fi Phone Route:sip:49xxxxx@21.1.7.8;ftag=C2E2D6CF845EA11AEBC2;lr=on,sip:492405690929@21.28.17.18:5060

When loggin with debug = 10 , i do not see some errors in syslog.

The Gateway then sends 6 more "OK" and the terminate by sending "BYE". The Phone answers with "200 OK" .. ?

Regards, Markus

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