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New Member

SIP intermittent one-way speech on CME

Hi All,

We have a problem with our IP telephone system. We have a Cisco CME and mixture of Cisco and SIP Snom phones. Our problem is that when we make a call (outside calls) from any of our SIP phones, we receiving party can't hear us but we can hear them. We don't have this problem with the Cisco phones.

Any Idea what the problem is?

6 REPLIES
Hall of Fame Super Gold

Re: SIP intermittent one-way speech on CME

Do you have nat or fw between the sip phones and cme ?

New Member

Re: SIP intermittent one-way speech on CME

There is not NAT or Firewall. The IP phones and the CME are on the same VLAN. The other thing is that the system can work perfect for may be a week or so and then the problem starts again.

Also, I don't have QoS running on my LAN. Can that cause a peoblem?

Hall of Fame Super Gold

Re: SIP intermittent one-way speech on CME

QoS has nothing to do with that.

Which exact IOS are you using ?

New Member

Re: SIP intermittent one-way speech on CME

Cisco IOS Software, 3800 Software (C3825-IPVOICEK9-M), Version 12.4(15)T1, RELEASE SOFTWARE (fc2)

Hall of Fame Super Gold

Re: SIP intermittent one-way speech on CME

Hi, recommend you switch to 12.4(11)XJ4 and try again.

New Member

Re: SIP intermittent one-way speech on CME

Thanks. I will try it

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