[cisco-voip] 8831 Conference phone call drops

[Martin Schmuker]

Hi Dave,

do you have any other SIP devices where call flow or signaling has to pass Checkpoint?

Are any SIP inspections turned off on Checkpoint?

Regards, Martin

Von: cisco-voip [mailto:cisco-voip-bounces at puck.nether.net] Im Auftrag von Dave Wolgast
Gesendet: Mittwoch, 12. Februar 2014 23:56
An: Cisco VOIP Newsletter - puck.nether.net
Betreff: [cisco-voip] 8831 Conference phone call drops

My customer has 3 beautiful new 8831 SIP conference phones running SIP load 9-3-3-5. The customer is running CUCM 9.1(2)SU1.

When we make a call from the phone to either internal or PSTN destinations, the remote phone rings. When answered, we get about 1 second of rtp to the 8831, then it drops with the message "Lost connection with server. Call in progress will be preserved." The call stays up on the remote side with dead air.

The customer has a checkpoint firewall between CUCM and the users, and sees the firewall dropping packets from the phone classified as sip_any-tcp-ipv6. This is confusing because we are not running IPv6 anyplace and have explicitly disallowed it in Common Phone Configuration.

Does anyone have any ideas/advice?


--
Dave Wolgast
Livonia, NY
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