Problem SIP Trunk CISCO<->MITEL

[vorlander]

Hi to everyone.

We have a problem with SIP trunk between Cisco <-> Mitel.

If an user in cisco call a mitel user everythink in ok.

Sometime when mitel user call a Cisco user, mitel user can hear the cisco user, but cisco user cannot.

In mitel's logs, we have messages like this:

  Port:14fd9f90 Could not Create a compatible MD. Event SMH_FSM_ANSWER State: SMH_FSM_WAITING_ANSWER

Anyone can help me?

Thank you

[sadzas]

One way audio?

You should to check the RTPs, the UDP ports.