Can ping across WAN but can't telnet

Switch A -> Router A -> 20Mb fiber WAN -> Router B

•  Router A and Router B can ping and telnet to each other.
• Hosts at site B have access to all resources at and beyond Site A using Router B as gateway.
• Switch A can ping Router B but cannot telnet to it.  There are no ACLs and debug telnet shows nothing.
• Router B can ping Switch A but cannot telnet to it.  Again, no ACLs and no debug output.

Long story short,  had to manually enter "ip classless" on Router B, despite supposedly being enabled by default.
 

The big problem here was Router B is also a voice gateway off a CUCM at site A.  Although MGCP FXO ports show registered in CUCM, show ccm-manager on the gateway indicates the CUCM as down.  The analog ports will only get a new configuration if I no ccm-manager config and ccm-manager config again, although call processing worked.

There is probably more to this story, but I haven't found it yet.  Moving on...

  

Router A#sh ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route

Gateway of last resort is 10.203.3.250 to network 0.0.0.0
10.0.0.0/24 is subnetted, 4 subnets
C 10.201.201.0 is directly connected, GigabitEthernet0/1
C 10.203.3.0 is directly connected, GigabitEthernet0/0
S 10.203.10.0 [1/0] via 10.201.201.202
S 10.203.12.0 [1/0] via 10.201.201.202
S* 0.0.0.0/0 [1/0] via 10.203.3.250

Router A#sh ip int b
Interface IP-Address OK? Method Status Protocol
GigabitEthernet0/0 10.203.3.5 YES NVRAM up up
GigabitEthernet0/1 10.201.201.201 YES manual up up

  

Switch A#sh ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route

Gateway of last resort is 10.203.4.254 to network 0.0.0.0
172.31.0.0/24 is subnetted, 1 subnets
C 172.31.254.0 is directly connected, Vlan5
10.0.0.0/8 is variably subnetted, 19 subnets, 3 masks
S 10.201.201.0/24 [1/0] via 10.203.3.5
S 10.11.253.247/32 [1/0] via 10.12.232.1
S 10.70.4.0/22 [1/0] via 10.12.232.1
S 10.0.104.0/22 [1/0] via 10.12.232.1
S 10.0.100.0/22 [1/0] via 10.12.232.1
S 10.11.244.130/32 [1/0] via 10.12.232.1
S 10.11.253.113/32 [1/0] via 10.12.232.1
S 10.110.213.32/32 [1/0] via 10.12.232.1
C 10.203.3.0/24 is directly connected, Vlan3
S 10.10.220.30/32 [1/0] via 10.12.232.1
S 10.203.5.0/24 [1/0] via 10.203.4.254
C 10.203.4.0/24 is directly connected, Vlan4
S 10.203.6.0/24 [1/0] via 10.203.4.254
S 10.203.10.0/24 [1/0] via 10.203.3.5
S 10.203.12.0/24 [1/0] via 10.203.3.5
S 10.10.220.7/32 [1/0] via 10.12.232.1
S 10.10.219.0/24 [1/0] via 10.12.232.1
S 10.60.208.0/22 [1/0] via 10.12.232.1
C 10.12.232.0/22 is directly connected, GigabitEthernet0/40
S* 0.0.0.0/0 [1/0] via 10.203.4.254

Router B#sh ip route
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
+ - replicated route, % - next hop override

Gateway of last resort is 10.201.201.201 to network 0.0.0.0

S* 0.0.0.0/0 [1/0] via 10.201.201.201
10.0.0.0/8 is variably subnetted, 6 subnets, 2 masks
C 10.201.201.0/24 is directly connected, GigabitEthernet0/0
L 10.201.201.202/32 is directly connected, GigabitEthernet0/0
C 10.203.10.0/24 is directly connected, GigabitEthernet0/1.1
L 10.203.10.1/32 is directly connected, GigabitEthernet0/1.1
C 10.203.12.0/24 is directly connected, GigabitEthernet0/1.100
L 10.203.12.1/32 is directly connected, GigabitEthernet0/1.100
72.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 72.88.81.0/24 is directly connected, GigabitEthernet0/2
L 72.88.81.202/32 is directly connected, GigabitEthernet0/2
Router B#sh ip int b
Interface IP-Address OK? Method Status Protocol
Embedded-Service-Engine0/0 unassigned YES NVRAM administratively down down
GigabitEthernet0/0 10.201.201.202 YES NVRAM up up
GigabitEthernet0/1 unassigned YES NVRAM up up
GigabitEthernet0/1.1 10.203.10.1 YES NVRAM up up
GigabitEthernet0/1.100 10.203.12.1 YES NVRAM up up
GigabitEthernet0/2 72.88.81.202 YES NVRAM up up