1. Take a look at the QoS SRND below. Specifically, see the WAN Aggregator QoS Design -> WAN Edge Classification and Provisioning Models section. A standard model to use is the 3 Class WAN Edge Model. This model allocates 33% for media traffic, 5% for signalling, and 62% for best effort data. SIP should fall into the signalling traffic category.
You either need fewer calls, more bandwidth, or RTP header compression.
For acceptable performance you need to leave some overhead for router control traffic. This is especially true on a low speed 128kb link where exceeding the 75% max would not be a good idea. If you have 4 calls taking 30kb each, there is no "rest" left for data on the uplink side. That may be a problem for data users.
Is the modem interface serial or ethernet? If it is serial running HDLC or PPP, and the other end is another router you should be able to use RTP header compression which would get your per call bandwidth down to 13 kb, which would give you some breathing room. Not sure if compression is supported on a 871, but it might be worth upgrading if need be.
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