I provide T1 service to a customer that is subscribed to a SIP Trunking provider.
Their T1 terminates on a PC-MC-T3 slot on a 7206VXR/NPE-G2
Their T1 device is an Adtran TA912 IAD using FXS interfaces to their legacy PBX.
The customer complains that the remote caller's voice is choppy and gets cutoff, sometimes to an extreme point. The remote caller hears my customer's voice just fine.
My customer has requested we implement QoS for SIP on their T1 and to a Fast Ethernet interface on the same router that connects to the Internet, and we have no problem doing that as we anticipate similar customer needs increasing.
What is the best method to provide QoS on PPP-Multilink, inbound and outbound, and the inbound from the public Internet. The adtran seems pretty flexible and the customer wil handle that configuration, but I need some help on the Cisco end for a configuration to place inbound/toubound on T1 interfaces and inbound w/ what I am guessing will be packeting marking for RTP and SIP?