How to replicate CASE statements

Content

MY Query

select Source.LookupName as Source, Incident.CustomFields.c.telephone_call as Telephone ,COUNT(*) from Incident WHERE Incident.StatusWithType.Status.ID IN (2,103) GROUP BY Source.LookupName, Incident.CustomFields.c.telephone_call =1 order by Incident.CustomFields.c.telephone_call LIMIT 10000

This brings back

Incident Editor        23
Webchat    0    9259
Techmail - Service Mailbox    0    82
Contact Editor    0    123
Site Feedback    0    25
Incident Editor    0    12198
Feedback on Answers    0    166
Raise a Request    0    43981
Incident Editor    1    14774
Webchat    1    2

As you can see, Incident editor is brought back 3 times. Once where telephone = 1, once for telephone = 0 and one for blank

However, I want to combine 0 and null. I'd normally do this with a CASE statement but as they are not allowed, how would one achieve this in ROQL?