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New Member

RTP & IP precedence

We're running a 3745 as a gateway with an E1 into the PSTN. The 3745 connects to a 3750 in router -switch mode, via a FDX 100Mbps connection. The 3750 connects to seven 3550 switches via MM SX interfaces running FDX, all 3550's have in-line power UTP connections.

When we monitor [using NetMon]the IPT traffic to and from an IP phone the RTP-IP precedence is Critical/Exp outbound and Routine inbound.

When we monitor the IPT traffic to and from the gateway we see that the traffic from the IP phone now has an RTP-IP precedence of Routine, whereas the traffic from the gateway has an RTP-IP precedence of Critical/Exp.

Is this to be expected?

If so, can it be changed to have a RTP-IP pecedence of Critical throughout the path from gateway to IP phone?

2 REPLIES
New Member

Re: RTP & IP precedence

This will all depend on how QOS has been configured on your switches. How the Trunks are setup etc. I suggest you ensure that all LAN ports are set to QOS Trust COS and trunks setup to prioritise them

New Member

Re: RTP & IP precedence

Thanks for the response.

I answer to your query; the LAN ports are setup to "QoS Trust Cos" and the trunks are setup to prioritise appropriately. However we are concerned that there may be issues between the two layer 3 devices, 3750 & 3745, under high load as there is no L2 trunking only, CEF.

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