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Community Member

interesting voip issue

Hi there,

I was wondering if someone could help me with an interesting issue I have been experiencing with VoIP. I have a VoIP link in place that sporadically experiences loss of voice within a conversation of around 3 - 5 seconds.

Site A is the hub site which acts as a local breakout point and connects together three other sites, B, C and D, each having its own 2mb leased line. At each site there is a PBX integrated using an E1 connection (NM-HDV) into a Cisco 3640. Site A also has a 3640. When calling from site B and C to D (via A), the call path inbound to that site experiences loss of voice randomly and intermittently. But the return path is fine.

Site A: 3640 12.2(12)

Site B, C and D: 12.2(7)

Kind Regards

Community Member

Re: interesting voip issue

Are you implementing the RTP commpression, VAD or QoS in the path of the voice?

Community Member

Re: interesting voip issue

Yes we are using RTP header compression, QoS and no VAD on the circuits. I have disabled RTP header compression on the affected link to see if this resolves the issue. Are there issues with RTP header compression caused by different IOS releases?

Community Member

Re: interesting voip issue

Yes, I have ever troubleshooting many problem casued by RTP header comperession.

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