Voice is stopping in H.323 -> SIPphone direction

[alex37]

Hi all! (Excuse my English, is not native)
IPO 500v2, 9.0.0.437
The 1608/1616/E129 SIP phones is presented.

During the call between categories (H.323 <-> SIP) the voice is disappearing
about 5-8 sec from the connect, in one direction (16xx -> E129).

Next methods was used:
- allow/deny direct media-path (in all combo)
- Forced assigning of a single codec (g.711 or g.729)
- enabling "Keepalive" in [System->LAN] - both RTP and RTP+RTCP
- changing Layer4 protocol in [System->LAN]: UDP/TCP/TLS (all combo)

There are no ideas more. Whats can be wrong?
Thank you!

 

[janni78]

Are all the phones on the same subnet?

"Trying is the first step to failure..." - Homer

 

[alex37]

Yes. One DHCP, one IPaddress pool.
Option 242, 66 is assigned.

 

[janni78]

Although I would start by upgrading from 9.0.0.

9.0.3 was the first I ever installed at a customer, and the latest is 9.0.11.

"Trying is the first step to failure..." - Homer

 

[alex37]

Sorry, my mistake.
IPO rel. 9.1.0.0.(437), no 9.0.0.(437)

All firmware files is updated.
The problem is still there.

 

[janni78]

well, 9.1.0.0 isn't great either, I would bump it it at least 9.1.6.

"Trying is the first step to failure..." - Homer