Cisco SPA 122

[Frank]

Anybody get the Cisco SPA 122 to work properly. I can receive calls, call extension to extension, but cannot call outbound. Receiving SIP error 488.

Tried every combination of dial plan and nothing works.

 

[Frank]

I have narrowed it down to my upstream provider. Changed outbound trunk and all works. Something about the Cisco. I'll have to do a packet capture and figure it out.

 

[DigitalDaz]

Frank, in your advanced sip settings look at the rtp packet size, it will probably be set to 30ms, it needs to be 20ms, you will porbably see it as 0.03, needs changing to 0.02

 

[Frank]

I'll try that and let you know.