HEAD END:
interface Serial3/0
 description Sprint
 no ip address
 no ip redirects
 no ip unreachables
 no ip proxy-arp
 encapsulation ppp
 ip policy route-map voice-video
 keepalive 10 3
 no fair-queue
 pulse-time 3
 ppp multilink
 ppp multilink group 1
end

B1-CORER2-7206#sh run int s3/1
Building configuration...

Current configuration : 267 bytes
!
interface Serial3/1
 description BellSouth
 no ip address
 no ip redirects
 no ip unreachables
 no ip proxy-arp
 encapsulation ppp
 ip policy route-map voice-video
 keepalive 10 3
 no fair-queue
 pulse-time 3
 ppp multilink
 ppp multilink group 1
end

B1-CORER2-7206#sh run int multi1
Building configuration...

Current configuration : 280 bytes
!
interface Multilink1
 description Multilink-LONG-SHR
 ip address 10.1.1.33 255.255.255.252
 ip pim sparse-dense-mode
 ip multicast boundary 21
 ppp multilink
 ppp multilink links minimum 1
 ppp multilink interleave
 ppp multilink group 1
 service-policy output QOS-OUT
end

B1-CORER2-7206#sh ppp multi

Multilink1
  Bundle name: Longview
  Remote Endpoint Discriminator: [1] Longview
  Local Endpoint Discriminator: [1] shreveport-rtr-b
  Bundle up for 1w1d, total bandwidth 1544, load 50/255
  Receive buffer limit 12000 bytes, frag timeout 1000 ms
  Interleaving enabled
    0/0 fragments/bytes in reassembly list
    110286 lost fragments, 18403099 reordered
    21/2574 discarded fragments/bytes, 19 lost received
    0xF4D808 received sequence, 0xF86301 sent sequence
  Member links: 1 active, 1 inactive (max not set, min 1)
    Se3/0, since 1w1d, 5790 weight, 1496 frag size
    Se3/1 (inactive)
No inactive multilink interfaces